[upstreaming] Revert removal of comment in SBAddress.h

Author: Teemperor

lldb/include/lldb/API/SBAddress.h

@@ -31,6 +31,8 @@ class LLDB_API SBAddress {
 
   explicit operator bool() const;
 
+  // operator== is a free function
+
   bool operator!=(const SBAddress &rhs) const;
 
   bool IsValid() const;