[ELF] - Fix comment. NFC.

llvm-svn: 313523

lld/ELF/OutputSections.cpp

@@ -251,7 +251,7 @@ void OutputSectionFactory::addInputSec(InputSectionBase *IS,
     return;
   }
 
-  // Sections with the SHT_GROUP attribute reach here only when the - r option
+  // Sections with the SHT_GROUP attribute reach here only when the -r option
   // is given. Such sections define "section groups", and InputFiles.cpp has
   // dedup'ed section groups by their signatures. For the -r, we want to pass
   // through all SHT_GROUP sections without merging them because merging them