[clang] Remove malformed brief commands in comments (NFC) (PR #70746)

[Timm Baeder via cfe-commits]

================
@@ -1291,20 +1291,20 @@ class TargetInfo : public TransferrableTargetInfo,
     fillValidCPUList(Values);
   }
 
-  /// brief Determine whether this TargetInfo supports the given CPU name.
+  /// Determine whether this TargetInfo supports the given CPU name.
   virtual bool isValidCPUName(StringRef Name) const {
     return true;
   }
 
-  /// brief Determine whether this TargetInfo supports the given CPU name for
+  /// Determine whether this TargetInfo supports the given CPU name for
   // tuning.
----------------
tbaederr wrote:

```suggestion
  /// tuning.
```

https://github.com/llvm/llvm-project/pull/70746