[clang] [docs] Fix markdown migration defects in the user manual (PR #210785)

[Aaron Ballman via cfe-commits]

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@@ -55,7 +55,8 @@ to be compatible with the Visual C++ compiler, cl.exe.
 In addition to language-specific features, Clang has a variety of
 features that depend on what CPU architecture or operating system is
 being compiled for. Please see the {ref}`Target-Specific Features and
-Limitations <target_features>` section for more details.
+Limitations <target_features>` section for
+more details.
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AaronBallman wrote:

Formatting went sideways?

https://github.com/llvm/llvm-project/pull/210785