[tools] Fix typo in Input file name option in llvm-cat

Author: AmrDeveloper

llvm/tools/llvm-cat/llvm-cat.cpp

@@ -44,7 +44,7 @@ static cl::opt<std::string> OutputFilename("o", cl::Required,
                                            cl::cat(CatCategory));
 
 static cl::list<std::string> InputFilenames(cl::Positional,
-                                            cl::desc("<input  files>"),
+                                            cl::desc("<input files>"),
                                             cl::cat(CatCategory));
 
 int main(int argc, char **argv) {