[llvm-ar] --help: fix unquoted angle bracket (#101364)

Changes the argument in llvm-ar help message from `-M [<mri-script]` to
`-M [< mri-script]`

Author: LinuxUserGD

llvm/tools/llvm-ar/llvm-ar.cpp

@@ -130,7 +130,7 @@ static void printArHelp(StringRef ToolName) {
          << "USAGE: " + ToolName +
                 " [options] [-]<operation>[modifiers] [relpos] "
                 "[count] <archive> [files]\n"
-         << "       " + ToolName + " -M [<mri-script]\n\n";
+         << "       " + ToolName + " -M [< mri-script]\n\n";
 
   outs() << ArOptions;
 }