Updated collate and charset description (#2)

* Updated db defined type strings documentation

* Updated collate and charset description

* Update REFERENCE.md

Author: benjamin-robertson

REFERENCE.md

@@ -1138,15 +1138,15 @@ Default value: `$name`
 
 Data type: `Any`
 
-The character set for the database. Must be set with collate to avoid corrective changes.
+The character set for the database. Must have the same value as collate to avoid corrective changes. See https://dev.mysql.com/doc/refman/8.0/en/charset-mysql.html for charset and collation pairs.
 
 Default value: `'utf8'`
 
 ##### <a name="collate"></a>`collate`
 
 Data type: `Any`
 
-The collation for the database. Must be set with charset to avoid corrective changes.
+The collation for the database.  Must have the same value as charset to avoid corrective changes. See https://dev.mysql.com/doc/refman/8.0/en/charset-mysql.html for charset and collation pairs.
 
 Default value: `'utf8_general_ci'`
 

manifests/db.pp

@@ -18,9 +18,9 @@
 # @param dbname
 #   The name of the database to create.
 # @param charset
-#   The character set for the database. Must be set with collate to avoid corrective changes.
+#   The character set for the database. Must have the same value as collate to avoid corrective changes. See https://dev.mysql.com/doc/refman/8.0/en/charset-mysql.html for charset and collation pairs.
 # @param collate
-#   The collation for the database. Must be set with charset to avoid corrective changes.
+#   The collation for the database.  Must have the same value as charset to avoid corrective changes. See https://dev.mysql.com/doc/refman/8.0/en/charset-mysql.html for charset and collation pairs.
 # @param host
 #   The host to use as part of user@host for grants.
 # @param grant