missed help for access show. adding it.

[begoldsm]

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• The PR has modified HISTORY.rst with an appropriate description of the change.

Command Guidelines

• Each command and parameter has a meaningful description.
• Each new command has a test.

(see Authoring Command Modules)

[codecov-io]

Codecov Report

Merging #2743 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2743      +/-   ##
==========================================
+ Coverage   61.16%   61.16%   +<.01%     
==========================================
  Files         480      480              
  Lines       25710    25711       +1     
  Branches     3888     3888              
==========================================
+ Hits        15725    15726       +1     
+ Misses       9101     9056      -45     
- Partials      884      929      +45

Impacted Files	Coverage Δ
...ure-cli-dls/azure/cli/command_modules/dls/_help.py	100% <100%> (ø)	⬆️
...e-cli-iot/azure/cli/command_modules/iot/_params.py	95.74% <0%> (ø)	⬆️
...re-cli-vm/azure/cli/command_modules/vm/commands.py	90.47% <0%> (ø)	⬆️
...ce/azure/cli/command_modules/appservice/_params.py	93.93% <0%> (ø)	⬆️
src/azure-cli-core/azure/cli/core/telemetry.py	54.1% <0%> (ø)	⬆️
...-cli-role/azure/cli/command_modules/role/custom.py	19.28% <0%> (ø)	⬆️
...i-cloud/azure/cli/command_modules/cloud/_params.py	92.3% <0%> (ø)	⬆️
...ource/azure/cli/command_modules/resource/custom.py	54.7% <0%> (ø)	⬆️
...gure/azure/cli/command_modules/configure/custom.py	16.21% <0%> (ø)	⬆️
...ure-cli-vm/azure/cli/command_modules/vm/_params.py	96.13% <0%> (ø)	⬆️
... and 16 more

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