Correct the spelling of endpoints for the Invalid IDMS Endpoint Error

[atomicfruitcake]

Correct the spelling of endoints to endpoint when raising an Invalid IDMS Endpoint Error

[codecov-io]

Codecov Report

Merging #2223 (a620a6e) into develop (dd10b44) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #2223   +/-   ##
========================================
  Coverage    98.23%   98.23%           
========================================
  Files           58       58           
  Lines        10852    10852           
========================================
  Hits         10661    10661           
  Misses         191      191           

Impacted Files	Coverage Δ
botocore/exceptions.py	99.48% <100.00%> (ø)

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[nateprewitt]

Thanks for this, @atomicfruitcake!