fixed: typographic error in help
Changed "extention" to "extension"
@@ -324,7 +324,7 @@ $ fd needle
.RI "Start a search in a given directory (" /var/log "):"
$ fd nginx /var/log
.TP
-.RI "Find all Python files (all files with the extention " .py ") in the current directory:"
+.RI "Find all Python files (all files with the extension " .py ") in the current directory:"
$ fd -e py
.TP
.RI "Open all search results with vim:"
