SDK 2.1.0 documentation edits

[ankursarin]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build was run locally and any changes were pushed
• Lint has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A
Also closes #200

What is the new behavior?

Docs can be reviewed at https://ankursarin.github.io/virtualization-sdk/Building_Your_First_Plugin/Initial_Setup/

• Standardize on Lua (instead of lua)
• Standardize on Python (instead of python)
• Fix a broken link in docs/docs/Best_Practices/Sensitive_Data.md
• Fix a broken "note" in docs/docs/Best_Practices/Sensitive_Data.md (it was not being encoded as a note due to incorrect spacing)
• Replaced "contact Delphix Support" with "contact the Delphix Virtualization SDK Engineering team" in docs/docs/Versioning_And_Upgrade/Lua_Toolkit_To_SDK_Plugin_Migration/Overview.md
• Replaced Sanity Check with Quick Check in Initial_Setup.md
• Some minor re-wording.

Does this introduce a breaking change?

• Yes
• No

Other information