improve module documentation

[lowlydba]

Description

Fix missing examples & add the DbaTools module requirement to each module's docs

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue) - Fixes #
• New feature (non-breaking change which adds functionality)

Checklist:

• I have read/followed the CONTRIBUTING document.
• I have read/followed the PR Quick Start Guide # TODO: update with link to published doc
• I have added tests to cover my changes or they are N/A.
• New module options/parameters include a version_added property.

[codecov-commenter]

Codecov Report

Merging #47 (49c5189) into main (613dbde) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #47   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files          33       33           
  Lines        1014     1014           
=======================================
  Hits          963      963           
  Misses         51       51           

Impacted Files	Coverage Δ
plugins/modules/agent_job.py	100.00% <ø> (ø)
plugins/modules/agent_job_category.py	100.00% <ø> (ø)
plugins/modules/agent_job_schedule.py	100.00% <ø> (ø)
plugins/modules/agent_job_step.py	100.00% <ø> (ø)
plugins/modules/database.py	100.00% <ø> (ø)
plugins/modules/login.py	100.00% <ø> (ø)
plugins/modules/maintenance_solution.py	100.00% <ø> (ø)
plugins/modules/memory.py	100.00% <ø> (ø)
plugins/modules/nonquery.py	100.00% <ø> (ø)
plugins/modules/resource_governor.py	100.00% <ø> (ø)
... and 5 more

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