[DOCS] Update hash-password example with single quotes (#1537)

* [Doc] Single quote the hash-password input

Closes #1536

* Update docs/configuration/authentication/file.md

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

docs/configuration/authentication/file.md

@@ -90,9 +90,10 @@ you could generate a 16 byte salt and provide it with the `--salt` flag.
 Example: `authelia hash-password --salt abcdefghijklhijl`. For argon2id the salt must 
 always be valid for base64 decoding (characters a through z, A through Z, 0 through 9, and +/).
 
+Passwords passed to `hash-password` should be single quoted if using special characters to prevent parameter substitution.
 For instance to generate a hash with the docker image just run:
 
-    $ docker run authelia/authelia:latest authelia hash-password yourpassword
+    $ docker run authelia/authelia:latest authelia hash-password 'yourpassword'
     Password hash: $argon2id$v=19$m=65536$3oc26byQuSkQqksq$zM1QiTvVPrMfV6BVLs2t4gM+af5IN7euO0VB6+Q8ZFs
 
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