Update protobuf.spec

[davidlange6]

clarify the documentation for updating protobuf

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for branch IB/CMSSW_9_1_X/gcc530.

@cmsbuild, @smuzaffar, @iahmad-khan, @davidlange6 can you please review it and eventually sign? Thanks.
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[davidlange6]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/18194/console

[cmsbuild]

-1

Tested at: ed3dfe2

You can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2887/18194/summary.html

I found follow errors while testing this PR

Failed tests: UnitTests

• Unit Tests:

I found errors in the following unit tests:

---> test testAlignmentOfflineValidation had ERRORS

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2887/18194/summary.html