changing the description from MediaSourceBase::getSourceFieldName() return...

changing the description from MediaSourceBase::getSourceFieldName() return docblock to reflect what the method does.

Closes #3249889

added 1 commit

• 6dff52ad - fixing typo

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added 4 commits

• 6dff52ad...17999022 - 2 commits from branch project:9.3.x
• 1d0a18d2 - changing the description from MediaSourceBase::getSourceFieldName() return...
• f624547e - fixing typo

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