fix(docs): example of Storage#testIamPermissions

[athakor]

Fixes #433

[codecov]

Codecov Report

Merging #434 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #434      +/-   ##
============================================
+ Coverage     63.19%   63.22%   +0.02%     
- Complexity      608      609       +1     
============================================
  Files            32       32              
  Lines          5111     5117       +6     
  Branches        472      488      +16     
============================================
+ Hits           3230     3235       +5     
  Misses         1717     1717              
- Partials        164      165       +1     

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/com/google/cloud/storage/Storage.java	80.90% <ø> (ø)	0.00 <0.00> (ø)
...main/java/com/google/cloud/storage/BucketInfo.java	81.57% <0.00%> (-0.14%)	83.00% <0.00%> (ø%)
...ain/java/com/google/cloud/storage/StorageImpl.java	81.00% <0.00%> (+0.04%)	138.00% <0.00%> (ø%)
...e/src/main/java/com/google/cloud/storage/Blob.java	82.18% <0.00%> (+0.10%)	30.00% <0.00%> (+1.00%)
...gle/cloud/storage/testing/RemoteStorageHelper.java	64.51% <0.00%> (+0.58%)	9.00% <0.00%> (ø%)

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