Update codeNavigation status for C, C++, and Scala

[ashis-baral]

Why:

Closes:

The github-language-support article's "Code navigation" column marked C, C++, and Scala as not supported (✗), but the navigating-code-on-github article lists C, C++, and Scala languages supported code navigation feature. This was an inconsistency between the two articles.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Updated data/tables/supported-code-languages.yml to mark codeNavigation as supported for:

• C
• C++
• Scala

This corrects the table in content/get-started/learning-about-github/github-language-support.md so it matches the list of supported languages documented on the code navigation page.

Verified code navigation works for all three languages using a small test repo (code-navigation):

C — add function definition + reference resolved

C++ — Calculator::add definition + reference resolved

Scala — Calculator class definition + reference resolved:

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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