[LLDB] Update docs on building documentation #69858
Merged
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This patch updates the documentation to match recent changes and make it more clear. More specifically, the process for installing sphinx has changed with the transition to myst with the requirements.txt in llvm/docs being the preferred method for installation now. In addition, the docs-lldb-html target is never generated if swig isn't installed, so having something expliti in the documentation section (even if it is mentioned as a dependency of lldb itself above) probably doesn't hurt.