Fix typo (#87)

Author: calummoore

permissions.mdx

@@ -7,7 +7,7 @@ There are four ways to control who can [read](/read) and [write](/write) data in
 
  2. [Code](#code) (write only) - write code to check users permissions in collection functions
 
- 3. [Encryption](#encryption) (read only) - data is public but encrypted, only unauthorized users can decrypt it
+ 3. [Encryption](#encryption) (read only) - data is public but encrypted, only authorized users can decrypt it
 
 <Note>
   For read rules, the entire record is always returned. There is no way to define read rules for specific fields.