DOC: ssh: Clean up misplaced AWS-related bits

[kyleam]

These are presumably pastos from when the ssh resource was created.

[codecov]

Codecov Report

Merging #389 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
+ Coverage   89.63%   89.65%   +0.01%     
==========================================
  Files         139      139              
  Lines       10349    10349              
==========================================
+ Hits         9276     9278       +2     
+ Misses       1073     1071       -2

Impacted Files	Coverage Δ
reproman/resource/ssh.py	85.71% <100%> (+0.89%)	⬆️
reproman/tests/test_installed.py	85% <0%> (-5%)	⬇️
reproman/utils.py	85.73% <0%> (+0.17%)	⬆️
reproman/config.py	89.61% <0%> (+1.29%)	⬆️

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[mjtravers]

Yep, looks like the copy-paste method of coding did not get completely updated for SSH

Will merge