Fix documentation spelling, grammar, and punctuation errors

[Copilot]

Corrected spelling, grammar, and punctuation errors across 29 documentation files. Changes improve readability without altering technical content.

Changes by Category

Spelling corrections:

• bellow→below, aso→also, mater→matter, SkiaShap→SkiaSharp

Grammar fixes:

• Removed duplicate words ("the the chart", "place the place")
• Fixed verb forms ("Settings the EasingFunction"→"Setting the EasingFunction")
• Replaced awkward constructions ("He/She/*"→"they", "as far as"→"as long as")
• Corrected word choice (specially→especially, lets→let's, lineal→linear)

Capitalization standardization:

• LiveCharts, .NET (consistent throughout)

Code example corrections:

// Fixed incorrect property setter
- public double Population { get => population; set { x = population; OnPropertyChanged(); } }
+ public double Population { get => population; set { population = value; OnPropertyChanged(); } }

// Fixed method call
- series2.add(4);
+ ((ObservableCollection<double>)series2.Values).Add(4);

Files Updated

• Root: README.md, CONTRIBUTING.md
• docs/overview/: 7 files
• docs/cartesianChart/: 7 files
• docs/shared/: 4 files
• docs/samples/: 7 files
• docs/{geomapchart,polarchart,about}/: 3 files

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Test Results Summary (Failure) ❌ (4 / 4)

[Copilot]

Pull request overview

This PR polishes documentation across the repo by correcting spelling/grammar/punctuation and adjusting a few example snippets for clarity and correctness.

Changes:

• Fixes numerous typos, duplicated words, and punctuation issues across docs and root markdown files.
• Improves wording/capitalization consistency (e.g., LiveCharts/.NET) and clarifies several explanatory paragraphs.
• Updates some code examples (notably collection mutation and property access) to better reflect valid usage.

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/shared/series2.md	Rewords DataPadding description for readability (but currently documents the wrong type).
docs/shared/series.md	Improves prose and updates code examples for Values mutation and mapping sample.
docs/shared/polarlabels.md	Removes duplicated word in info block.
docs/shared/chart.md	Fixes grammar around easing builders and animation disabling statement.
docs/samples/lines/xy/template.md	Rewrites intro paragraph for clarity and correct grammar.
docs/samples/general/visualElements/template.md	Fixes duplicated phrase and improves punctuation/formatting in layout explanation.
docs/samples/general/multiThreading/template.md	Improves punctuation/grammar in concurrency guidance.
docs/samples/general/customTooltips/template.md	Fixes missing space after punctuation and improves readability.
docs/samples/general/chartToImage/template.md	Clarifies wording (“as long as”) and improves sentence structure (still has inconsistent ASP.NET/.NET Core capitalization).
docs/samples/events/tutorial/template.md	Removes duplicated “only” for clearer sentence.
docs/samples/axes/matchScale/template.md	Fixes typo (“mater”→“matter”) and improves punctuation.
docs/polarchart/overview.md	Changes TotalAngle example value (this alters demonstrated behavior).
docs/overview/1.9.animations.md	Improves sentence structure and fixes grammar (“provider”→“provides”).
docs/overview/1.5.mappers.md	Fixes wording/grammar and minor capitalization (JSON, let’s).
docs/overview/1.12.themes.md	Improves readability and fixes several grammar issues in theme explanation.
docs/geomapchart/heatlandseries.md	Improves prose and fixes minor formatting/spacing in sample code.
docs/cartesianChart/stackedlineseries.md	Fixes typos and improves punctuation in geometry description.
docs/cartesianChart/stackedcolumnseries.md	Fixes “aso”→“also”.
docs/cartesianChart/overview.md	Fixes duplicated word (“the the”).
docs/cartesianChart/legends.md	Renames/rewrites section to correctly describe custom legends (not tooltips).
docs/cartesianChart/columnseries.md	Fixes “aso”→“also”.
docs/cartesianChart/boxseries.md	Fixes “aso”→“also”.
docs/cartesianChart/axes.md	Fixes duplicated words/typos and improves inclusive language and punctuation.
README.md	Improves grammar, punctuation, and product naming consistency.
CONTRIBUTING.md	Fixes punctuation/grammar in style guide bullets and examples.

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[Copilot]

DataPadding is documented as System.Drawing.PointF, but in the codebase ISeries.DataPadding is LiveChartsCore.Drawing.LvcPoint. This type mismatch can mislead users; please update the docs to reference LvcPoint (and keep the sample consistent).

Suggested change

	The data padding is the minimum distance from the edges of the series to the axis limits. It is of type `System.Drawing.PointF`.
	The data padding is the minimum distance from the edges of the series to the axis limits. It is of type `LiveChartsCore.Drawing.LvcPoint`.

[Copilot]

The C# snippet declares series2 with an object initializer but does not terminate the statement before calling Add(...) on the next line, so the example as shown won’t compile. Please end the initializer with a semicolon (and ensure the rest of the snippet follows valid C# statement boundaries).

[Copilot]

The tip still uses ASP.net / .NET core capitalization. Elsewhere in the docs and in this PR you standardize on .NET; consider updating this line to ASP.NET and .NET Core for consistent product naming.

Suggested change

	Notice that the previous code also works in an `ASP.net` project, as long as you are using .NET core 3.1 or greater
	Notice that the previous code also works in an `ASP.NET` project, as long as you are using .NET Core 3.1 or greater

[Copilot]

This changes the TotalAngle example value from 50 to 270, which alters the behavior shown by the documentation. The PR description says changes don’t alter technical content; either revert this to a non-behavioral edit, or update the PR description to acknowledge the functional example change.