[NFC] Remove documentation comment to fix warning.

Remove the @return to fix the warning: '@returns' command used in a
comment that is attached to a function returning void [-Wdocumentation]

llvm-svn: 368957

llvm/tools/llvm-reduce/deltas/ReduceGlobalVars.cpp

@@ -14,7 +14,6 @@
 #include "ReduceGlobalVars.h"
 
 /// Removes all the Initialized GVs that aren't inside the desired Chunks.
-/// @returns the Module stripped of out-of-chunk GVs
 static void extractGVsFromModule(std::vector<Chunk> ChunksToKeep,
                                  Module *Program) {
   // Get GVs inside desired chunks