Fix minor issue with open api spec

[ganeshvlrk]

Add SubscriptionID parameter reference to Update Subscription

What did you implement:

Add SubscriptionID parameter reference to Update Subscription

How did you implement it:

Trivial change

How can we verify it:

N/A

Todos:

N/A

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov]

Codecov Report

Merging #413 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
- Coverage   63.85%   63.61%   -0.25%     
==========================================
  Files          29       29              
  Lines        1649     1649              
==========================================
- Hits         1053     1049       -4     
- Misses        553      557       +4     
  Partials       43       43

Impacted Files	Coverage Δ
router/router.go	56.62% <0%> (-1.33%)	⬇️

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[alexdebrie]

LGTM. Thanks, @ganeshvlrk.