Add two new config steps for Compose

[drinkthestars]

What

• Adds configuration steps for FunctionNaming, and UnusedPrivateMember to the Configuration for Compose section of the docs

Why & Related

• Library-specific configurations were removed in Remove library specific configurations #4101 which included the FunctionName ignore for @Composable functions, and an issue (Consider reverting the FunctionNaming defaults after 1.18.0-RC1 #3944) was raised around that. Since we now have a page for Compose configurations, this crucial one can be added there
• This issue wasn't previously raised, but @Preview composables get flagged as unused. Hence this change shows a configuration option for that as well
• References ignoreAnnotated from 1.19.0-RC1/RC2

[codecov]

Codecov Report

Merging #4322 (6178fcd) into main (520d314) will not change coverage.
The diff coverage is n/a.

❗ Current head 6178fcd differs from pull request most recent head 4b78d57. Consider uploading reports for the commit 4b78d57 to get more accurate results

@@            Coverage Diff            @@
##               main    #4322   +/-   ##
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  Coverage     84.22%   84.22%           
  Complexity     3258     3258           
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  Files           472      472           
  Lines         10309    10309           
  Branches       1820     1820           
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  Hits           8683     8683           
  Misses          666      666           
  Partials        960      960           

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