docs: clarify documentation on date formats.

[johnalowry]

I added the following code:

System.out.printf("Blob updatetime: %s", blob.getUpdateTime());

The output was

Blob updatetime: 1582157090238

I verified that this was ms after epoch:

$ date -d @1582157090
Wed 19 Feb 2020 04:04:50 PM PST

I also traced the code to this function:

https://github.com/googleapis/google-http-java-client/blob/master/google-http-client/src/main/java/com/google/api/client/util/DateTime.java#L53

I assumed that create and delete times used the same format.

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
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• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> ☕️

[frankyn]

Do:
git commit --amend
Lowercase the word Clarify

[codecov]

Codecov Report

Merging #196 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master    #196      +/-   ##
===========================================
+ Coverage     63.43%   63.5%   +0.06%     
  Complexity      540     540              
===========================================
  Files            30      30              
  Lines          4759    4759              
  Branches        427     427              
===========================================
+ Hits           3019    3022       +3     
+ Misses         1580    1577       -3     
  Partials        160     160

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/com/google/cloud/storage/BlobInfo.java	88.95% <ø> (ø)	88 <0> (ø)	⬇️
...gle/cloud/storage/testing/RemoteStorageHelper.java	63.93% <0%> (+2.45%)	9% <0%> (ø)	⬇️

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[frankyn]

Forgot to add, then do:
git push -f to force the commit amend.

[frankyn]

To fix lint issues run the following maven command:
mvn com.coveo:fmt-maven-plugin:format

[frankyn]

I'll merge once Code Format is fixed @johnalowry.

[johnalowry]

thanks - it should all be fixed now

[frankyn]

Thanks @johnalowry, format is still failing.

[johnalowry]

i ran the mvn command after the git push... i've run git push again and it looks like the checks are now running. hopefully that fixes.

[frankyn]

Fixed format, to get it over the hump. Thanks for your patience @johnalowry