Create update-vpc-link.rst

[sjpandruju]

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Description of changes:

Added sample for apigateway update-vpc-link operation

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[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.33%. Comparing base (5f07db1) to head (32c790d). :warning: Report is 529 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9405      +/-   ##
===========================================
- Coverage    93.39%   93.33%   -0.06%     
===========================================
  Files          210      209       -1     
  Lines        16983    16807     -176     
===========================================
- Hits         15861    15687     -174     
+ Misses        1122     1120       -2     

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[sjpandruju]

@elysahall completed the changes and ready for your review.