Updated documentation to include SHELL_COMPLETIONS_DIR (#861)

Modified doc/lsd.md to include documentation on SHELL_COMPLETIONS_DIR / OUT_DIR. This is from issue #853.
lsd-rs · Jun 29, 2023 · 711f661 · 711f661
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diff --git a/doc/lsd.md b/doc/lsd.md
@@ -163,3 +163,6 @@ lsd is a ls command with a lot of pretty colours and some other stuff to enrich
 
 `XDG_CONFIG_HOME`
 : Used to locate optional config file. If `XDG_CONFIG_HOME` is set, use `$XDG_CONFIG_HOME/lsd/config.yaml` else `$HOME/.config/lsd/config.yaml`.
+
+`SHELL_COMPLETIONS_DIR` or `OUT_DIR`
+: Used to specify the directory for generating a shell completions file. If neither are set, no completions file will be generated. The directory will be created if it does not exist.