chore: add docstrings for boto3_session param

Author: Tom McCarthy

aws_lambda_powertools/utilities/parameters/appconfig.py

@@ -29,6 +29,8 @@ class AppConfigProvider(BaseProvider):
         Application of the configuration to pass during client initialization
     config: botocore.config.Config, optional
         Botocore configuration to pass during client initialization
+    boto3_session : boto3.session.Session, optional
+            Boto3 session to use for AWS API communication
 
     Example
     -------

aws_lambda_powertools/utilities/parameters/dynamodb.py

@@ -30,6 +30,8 @@ class DynamoDBProvider(BaseProvider):
         Complete url to reference local DynamoDB instance, e.g. http://localhost:8080
     config: botocore.config.Config, optional
         Botocore configuration to pass during client initialization
+    boto3_session : boto3.session.Session, optional
+            Boto3 session to use for AWS API communication
 
     Example
     -------

aws_lambda_powertools/utilities/parameters/secrets.py

@@ -19,6 +19,8 @@ class SecretsProvider(BaseProvider):
     ----------
     config: botocore.config.Config, optional
         Botocore configuration to pass during client initialization
+    boto3_session : boto3.session.Session, optional
+            Boto3 session to use for AWS API communication
 
     Example
     -------

aws_lambda_powertools/utilities/parameters/ssm.py

@@ -19,6 +19,8 @@ class SSMProvider(BaseProvider):
     ----------
     config: botocore.config.Config, optional
         Botocore configuration to pass during client initialization
+    boto3_session : boto3.session.Session, optional
+            Boto3 session to use for AWS API communication
 
     Example
     -------