docs: fix vale linting errors

- are not > aren't
- auto-_ > auto _
- avoid backend
- cannot > can't
- do not > don't
- does not > doesn't
- ignore emoji code
- has not > hasn't
- ignore Microsoft.GeneralURL
- is not > isn't
- it is > it's
- no exclamation point
- put code inside code blocks
- put commit sha inside code blocks
- put exception message in code blocks
- remove slang
- should not > shouldn't
- they are > they're
- we are > we're
- will not > won't

docs/admin-manual/default-passwords.md

@@ -21,7 +21,7 @@ To change the password for a different user (requires _Administrator_ privileges
 
 Two of the most important passwords that should be changed _immediately_ after installation
 are the passwords used by the PostgreSQL database.
-It is strongly recommended that you do this before exposing your server to the internet beyond your internal network.
+It's strongly recommended that you do this before exposing your server to the internet beyond your internal network.
 
 1. Login to PostgreSQL with `sudo -u postgres psql`. The PostgreSQL shell - `postgres=#` - means that you have logged in successfully.
 2. Change the admin password with `ALTER USER postgres PASSWORD 'myPassword';`, where `myPassword` is the new password.