Fix obvious typo

[gftg]

Summary

The -fcf-protection option takes an optional argument, which allows the
requesting of control-flow protection on returns, or on indirect jumps
and calls, or both. One of the comments in the code applies to returns,
yet it mentions branches (for indirect calls and jumps). This patch
fixes this obvious typo.

[gftg]

/me wondering how to convert this draft submission into a regular one.

[gftg]

Testing that using arc diff --edit --verbatim converts from draft to
regular diff.

[gftg]

Update the commit message with something meaningful for the git history.

[pengfei]

LGTM.

clang/include/clang/Basic/TargetInfo.h

   virtual bool hasSjLjLowering() const {
     return false;
   }
 
   /// Check if the target supports CFProtection branch.
   virtual bool
   checkCFProtectionBranchSupported(DiagnosticsEngine &Diags) const;
 
-  /// Check if the target supports CFProtection branch.
+  /// Check if the target supports CFProtection return.
   virtual bool
   checkCFProtectionReturnSupported(DiagnosticsEngine &Diags) const;
 
   /// Whether target allows to overalign ABI-specified preferred alignment
   virtual bool allowsLargerPreferedTypeAlignment() const { return true; }
 
   /// Whether target defaults to the `power` alignment rules of AIX.
   virtual bool defaultsToAIXPowerAlignment() const { return false; }