amazon: added boto3_conn to GUIDELINES.md (#20305)

* amazon: added boto3_conn to GUIDELINES.md

* Update GUIDELINES.md

Light edits. Good to go.

lib/ansible/modules/cloud/amazon/GUIDELINES.md

@@ -112,13 +112,12 @@ if my_new_feauture_Parameter_is_set:
 ### Connecting to AWS
 
 To connect to AWS, you should use `get_aws_connection_info` and then
-`connect_to_aws`.
+`boto3_conn` (or `connect_to_aws` for boto).
 
-The reason for using `get_aws_connection_info` and `connect_to_aws` rather than doing it
-yourself is that they handle some of the more esoteric connection
-options such as security tokens and boto profiles.
+These functions handle some of the more esoteric connection options, such as security tokens and
+boto profiles.
 
-Some boto services require region to be specified. You should check for the region parameter if required.
+Some boto services require that the region is specified. You should check for the region parameter if required.
 
 #### boto
 
@@ -295,4 +294,4 @@ across VPCs.
 
 Pass any JSON policy dict to this function in order to sort any list contained therein. This is useful
 because AWS rarely return lists in the same order that they were submitted so without this function, comparison
-of identical policies returns false.
+of identical policies returns false.