[llvm] [NFC][LLVM][ADT] Remove function names from Doxygen comments (PR #195465)

[Nikita Popov via llvm-commits]

================
@@ -171,26 +171,26 @@ class BitVector {
       clear_unused_bits();
   }
 
-  /// empty - Tests whether there are no bits in this bitvector.
+  /// returns whether there are no bits in this bitvector.
----------------
nikic wrote:

```suggestion
  /// Returns whether there are no bits in this bitvector.
```

https://github.com/llvm/llvm-project/pull/195465