Fix broken links to modules which don't exist any more (#888) (#889)

[PR #888/5310d551 backport][stable-4] Fix broken links to modules which don't exist any more

This is a backport of PR #888 as merged into main (5310d55).
SUMMARY
The ec2 module no longer exists, and we don't call out the other Ansible 2.9 fact -> info renames any more (That was 4 major releases ago!)
ISSUE TYPE

Docs Pull Request

COMPONENT NAME
plugins/modules/aws_az_info.py
plugins/modules/ec2_instance.py
ADDITIONAL INFORMATION

Reviewed-by: Mark Chappell <None>

plugins/modules/aws_az_info.py

@@ -12,7 +12,6 @@
 version_added: 1.0.0
 description:
     - Gather information about availability zones in AWS.
-    - This module was called M(amazon.aws.aws_az_facts) before Ansible 2.9. The usage did not change.
 author: 'Henrique Rodrigues (@Sodki)'
 options:
   filters:

plugins/modules/ec2_instance.py

@@ -15,8 +15,8 @@
   - Create and manage AWS EC2 instances.
   - >
     Note: This module does not support creating
-    L(EC2 Spot instances,https://aws.amazon.com/ec2/spot/). The M(amazon.aws.ec2) module
-    can create and manage spot instances.
+    L(EC2 Spot instances,https://aws.amazon.com/ec2/spot/).
+  - The M(amazon.aws.ec2_spot_instance) module can create and manage spot instances.
 author:
   - Ryan Scott Brown (@ryansb)
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