docs: Remove whitespaces resolution from ap errors

docs/UserGuide.md

@@ -351,9 +351,9 @@ ap
  Error message | How to resolve
 ---------------|---------------
 `Invalid command format! …` | Ensure that the name, phone number, email address and address are specified.
-`Names should only contain alphanumeric characters and spaces, and it should not be blank` | Ensure that the name specified is not blank and contain only alphanumeric characters. Whitespaces at the start and end are trimmed.
-`Phone numbers should only contain numbers, and it should be at least 3 digits long` | Ensure that the phone number specified is not blank, contain only numbers and at least 3 digits long. Whitespaces at the start and end are trimmed.
-`Addresses can take any values, and it should not be blank` | Ensure that the address specified is not blank. Whitespaces at the start and end are trimmed.
+`Names should only contain alphanumeric characters and spaces, and it should not be blank` | Ensure that the name specified is not blank and contain only alphanumeric characters.
+`Phone numbers should only contain numbers, and it should be at least 3 digits long` | Ensure that the phone number specified is not blank, contain only numbers and at least 3 digits long. 
+`Addresses can take any values, and it should not be blank` | Ensure that the address specified is not blank.
 `Emails should be of the format local-part@domain and adhere to the following constraints: …` | Ensure that the email specified is not blank and adheres to the constraints specified. Whitespaces at the start and end are trimmed.
 `This person already exists in the address book.` | Ensure that the new name specified does not match an existing person.
 `Multiple values specified for the following single-valued field(s): …` | Ensure that there are no duplicate fields for name, email, address and phone number.