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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