Add gid option to Input File section

doc/manual-src/en/aria2c.rst

@@ -1806,6 +1806,7 @@ of URIs. These optional lines must start with white space(s).
   * :option:`ftp-reuse-connection <--ftp-reuse-connection>`
   * :option:`ftp-type <--ftp-type>`
   * :option:`ftp-user <--ftp-user>`
+  * :option:`gid <--gid>`
   * :option:`hash-check-only <--hash-check-only>`
   * :option:`header <--header>`
   * :option:`http-accept-gzip <--http-accept-gzip>`