[clang] [clang][analyzer][doc] Migrate user-related docs from HTML to RST (PR #97034)

[Donát Nagy via cfe-commits]

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+Obtaining the Static Analyzer
+=============================
+
+This page describes how to download and install the analyzer. Once the analyzer is installed, follow the asdf :doc:`CommandLineUsage` on using the commandline to get started analyzing your code.
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NagyDonat wrote:

Nice catch! :laughing: 

https://github.com/llvm/llvm-project/pull/97034