aws-help: add page (#6446)

pages/common/aws-help.md

@@ -0,0 +1,16 @@
+# aws help
+
+> Display help information about the AWS CLI.
+> More information: <https://docs.aws.amazon.com/cli/latest/reference/>.
+
+- Display help:
+
+`aws help`
+
+- List all available topics:
+
+`aws help topics`
+
+- Display help about a specific topic:
+
+`aws help {{topic_name}}`