typo in usage? (#1500)

tools/shaderc/shaderc.cpp

@@ -841,7 +841,7 @@ namespace bgfx
 			  "  -h, --help                    Help.\n"
 			  "  -v, --version                 Version information only.\n"
 			  "  -f <file path>                Input file path.\n"
-			  "  -i <include path>             Include path (for multiple paths use use -i multiple times).\n"
+			  "  -i <include path>             Include path (for multiple paths use -i multiple times).\n"
 			  "  -o <file path>                Output file path.\n"
 			  "      --bin2c <file path>       Generate C header file.\n"
 			  "      --depends                 Generate makefile style depends file.\n"