7.10 not 7.9.9 (there never was one named that)

docs/curl.1

@@ -350,7 +350,7 @@ appended. Appending 'k' or 'K' will count the number as kilobytes, 'm' or M'
 makes it megabytes while 'g' or 'G' makes it gigabytes. Examples: 200K, 3m and
 1G.
 
-This option was introduced in curl 7.9.9.
+This option was introduced in curl 7.10.
 
 If this option is used several times, the last one will be used.
 .IP "-l/--list-only"