docs: fix typos in mobile docs and MSBuild guide

[vaibhav8a]

Four typo fixes:

• Documentation/docs-mobile/binding-libs/customizing-bindings/troubleshooting-bindings.md:25 — targetting → targeting
• Documentation/docs-mobile/features/layout-code-behind/index.md:548 — overriden → overridden
• Documentation/docs-mobile/messages/java0000.md:32 — occured → occurred
• Documentation/guides/MSBuildBestPractices.md:387 — existance → existence

Docs prose only.

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[Copilot]

Pull request overview

This PR corrects minor spelling mistakes across the .NET for Android documentation set, improving clarity and professionalism without changing behavior.

Changes:

• Fixes a typo in the MSBuild best practices guide (“existance” → “existence”).
• Fixes typos in three docs-mobile pages (“targetting/overriden/occured” → “targeting/overridden/occurred”).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Documentation/guides/MSBuildBestPractices.md	Corrects a spelling error in the IncrementalClean discussion.
Documentation/docs-mobile/messages/java0000.md	Corrects a spelling error in troubleshooting guidance for JAVA0000.
Documentation/docs-mobile/features/layout-code-behind/index.md	Corrects a spelling error in the $(AndroidFragmentType) documentation.
Documentation/docs-mobile/binding-libs/customizing-bindings/troubleshooting-bindings.md	Corrects a spelling error in the binding troubleshooting checklist.

[jonathanpeppers]

@vaibhav8a can you sign the CLA? Otherwise, it's good to merge, thanks!