docs: add description to commands and index page

docs/content/commands/rclone_genautocomplete_fish.md

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+---
+date: 2020-05-18T10:38:09+01:00
+title: "rclone genautocomplete fish"
+description: "Output fish completion script for rclone."
+slug: rclone_genautocomplete_fish
+url: /commands/rclone_genautocomplete_fish/
+# autogenerated - DO NOT EDIT, instead edit the source code in cmd/genautocomplete/fish/ and as part of making a release run "make commanddocs"
+---
+## rclone genautocomplete fish
+
+Output fish completion script for rclone.
+
+### Synopsis
+
+
+Generates a fish autocompletion script for rclone.
+
+This writes to /etc/fish/completions/rclone.fish by default so will
+probably need to be run with sudo or as root, eg
+
+    sudo rclone genautocomplete fish
+
+Logout and login again to use the autocompletion scripts, or source
+them directly
+
+    . /etc/fish/completions/rclone.fish
+
+If you supply a command line argument the script will be written
+there.
+
+
+```
+rclone genautocomplete fish [output_file] [flags]
+```
+
+### Options
+
+```
+  -h, --help   help for fish
+```
+
+See the [global flags page](/flags/) for global options not listed here.
+
+### SEE ALSO
+
+* [rclone genautocomplete](/commands/rclone_genautocomplete/)	 - Output completion script for a given shell.
+