typo fix

wcclrun/main.cpp

@@ -177,7 +177,7 @@ int main(int argc, char** argv)
 			("ccl-file,C", value(&ccl_files),
 			 "CCL query file\n")
 			("files,f", value(&files),
-			 "Files to load, look at extecion to determine type\n")
+			 "Files to load, looking at the extension to determine type\n")
 			("corpus-from-stdin,I", value(&corpus_stdin)->zero_tokens(),
 			 "Read corpus from stdin\n")
 			("quiet,q", value(&quiet)->zero_tokens(),