Update usage message

… as I mislabeled the -m parameter as -l.

fedi2html

@@ -350,7 +350,7 @@ handle_post_url() {
 
 usage() {
 	echo "usage: $(basename "$0") [-h] [-IRc] POST_URL"
-	echo "       $(basename "$0") [-h] [-IRc] [-bBt] USER_URL"
+	echo "       $(basename "$0") [-h] [-IRcbBt] [-m MAX] USER_URL"
 	echo
 	echo "$(basename "$0") does exactly what it says on the tin: It formats"
 	echo 'a fediverse post (and its replies) into text. By default, into'
@@ -359,11 +359,11 @@ usage() {
 	echo '  -c             only print the responses (children) of a post'
 	echo '  -h             print this message and exit'
 	echo '  -I             display posts in reverse-chronological order'
-	echo '  -l             output at maximum the specified amount of posts'
 	echo '  -R             do not recursively display posts’ responses'
 	echo
 	echo '  -b             exclude reblogs/repeats from user feed'
 	echo '  -B             exclude top-level replies from user feed'
+	echo '  -m             output at maximum the specified amount of posts'
 	echo '  -t             filter posts from user feed by tag'
 	echo
 	echo 'It works with posts from any server that supports Mastodon’s API,'