NIFI-10502 Replaced "Flow File" with "FlowFile" in many places in the code base.

[dan-s1]

Summary

NIFI-10502
In addition to correcting the spelling of "Flow File" to "FlowFile" in the property named "Max Rows Per FlowFile" found in (ExecuteSQL, ExecuteSQLRecord, QueryDatabaseTable and QueryDatabaseTableRecord), the same correction was made in various other descriptions, comments and javdoc.

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[dan-s1]

@exceptionfactory I wanted to make the same changes in some of the headers in ControllerStatusReportingTask (lines 114 and 119-120) but I wasn't sure whether that would affect anything. Please advise.

[exceptionfactory]

Thanks for updates @dan-s1, the changes look good. The references in ControllerStatusReportingTask can also be adjusted, since they are just text-based headers. I will make those changes when I merge the PR.