docs(linter): always refer as "ES2015" instead of "ES6"

[sapphi-red]

It is now more common to refer ES6 / ES2015 as "ES2015" than "ES6". This PR updates multiple places to use "ES2015" instead of "ES6". It also removes some redundant "ES6" when it is not important anymore in context of those sentences.

[sapphi-red]

• docs(linter): always refer as "ES2015" instead of "ES6" #15411 👈 (View in Graphite)
• docs(linter/import/named): update "ES7" comment in examples #15410
• docs(linter,minifier): always refer as "ES Modules" instead of "ES6 Modules" #15409
• docs(linter/no-this-before-super): correct "Why is this bad?" section #15408
• docs(linter): add backquotes where appropriate #15407
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #15411 will not alter performance

_{Comparing 11-07-docs_linter_docs_always_refer_as_es2015_instead_of_es6_ (a698927) with 11-07-docs_linter_import_named_update_es7_comment_in_examples (94e57de)}

Summary

✅ 4 untouched
⏩ 33 skipped¹

Footnotes

1. 33 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[camc314]

Merge activity

• Nov 7, 10:08 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Nov 7, 10:08 AM UTC: camc314 added this pull request to the Graphite merge queue.
• Nov 7, 10:21 AM UTC: Merged by the Graphite merge queue.