Use shorthand syntax for instance type

[Fydon]

Possibly related to #484

Simplify the documentation for modify-instance-attribute by using shorthand syntax.

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[codecov-io]

Codecov Report

Merging #5615 into develop will decrease coverage by 0.16%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5615      +/-   ##
===========================================
- Coverage    92.52%   92.36%   -0.17%     
===========================================
  Files          196      196              
  Lines        15898    15733     -165     
===========================================
- Hits         14709    14531     -178     
- Misses        1189     1202      +13     

Impacted Files	Coverage Δ
awscli/compat.py	57.30% <0.00%> (-5.15%)	⬇️
awscli/commands.py	86.66% <0.00%> (-3.34%)	⬇️
awscli/customizations/ec2/decryptpassword.py	84.74% <0.00%> (-0.97%)	⬇️
awscli/arguments.py	94.23% <0.00%> (-0.77%)	⬇️
awscli/customizations/ec2/addcount.py	93.33% <0.00%> (-0.67%)	⬇️
awscli/help.py	96.19% <0.00%> (-0.29%)	⬇️
awscli/testutils.py	64.17% <0.00%> (-0.26%)	⬇️
awscli/customizations/streamingoutputarg.py	98.11% <0.00%> (-0.17%)	⬇️
awscli/clidriver.py	95.80% <0.00%> (-0.14%)	⬇️
awscli/argparser.py	94.56% <0.00%> (-0.12%)	⬇️
... and 19 more

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[Fydon]

I'm not sure what the next step is here. It's a one line change to documentation so I don't get why this change is blocked. Do I just need to rebase?

[kdaily]

Hi @Fydon, thanks for the contribution. We try to maintain consistency for the example syntax. The more explicit example is easier to compare to the API. Given how short this example is (there is only one parameter) the change to using shorthand does not provide much more clarity.

I do realize that the specifications for how to write examples are not available in our contributing guide, and I am going to work with our doc writing team to make that available.