Updated help text file

Author: danielp-canva

doc/help.txt

@@ -13,6 +13,7 @@ OPTIONS:
     -a  --activate  Activate cloudflare after creating record (for addrecord)
     -f  --format    Format when printing records (csv,json or table)
     -t  --type      Type of record (for dns record functions)
+    -n  --newtype   Type of record to update to when editing a record
     -p  --priority  Set priority when adding a record (MX or SRV)
     -q  --query     Comma separated filters to use when finding a record
     -l  --ttl       Set ttl on add or edit (120 - 86400 seconds, or 1 for auto)