[llvm] [LLVM][CodingStandard] Extend namespace qualifier rule to variables (PR #163588)

[Nikita Popov via llvm-commits]

================
@@ -860,27 +860,40 @@ your private interface remains private and undisturbed by outsiders.
     It's okay to put extra implementation methods in a public class itself. Just
     make them private (or protected) and all is well.
 
-Use Namespace Qualifiers to Implement Previously Declared Functions
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Use Namespace Qualifiers to Define Previously Declared Entities
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nikic wrote:

```suggestion
Use Namespace Qualifiers to Define Previously Declared Symbols
```
I think that would be a more typical term?

https://github.com/llvm/llvm-project/pull/163588