[clang] [clang][docs] Update CommandLineUsage and UsersManual with some flags (PR #209519)

[Ehren Bendler via cfe-commits]

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@@ -239,4 +257,3 @@ Detailed Usage
 ~~~~~~~~~~~~~~
 
 For extended documentation please refer to the `official site of CodeChecker <https://github.com/Ericsson/codechecker/blob/master/docs/usage.md>`_!
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ebendler wrote:

Auto-formatter in Zed is a bit overzealous about empty lines at the end of files. I'll put it back.

https://github.com/llvm/llvm-project/pull/209519