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NIFI-12498 Adjust docs on default behaviour of prioritizers (#8451)

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nifi-docs/src/main/asciidoc/user-guide.adoc
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@ -1432,13 +1432,16 @@ The following prioritizers are available:
- *FirstInFirstOutPrioritizer*: Given two FlowFiles, the one that reached the connection first will be processed first.
- *NewestFlowFileFirstPrioritizer*: Given two FlowFiles, the one that is newest in the dataflow will be processed first.
- *OldestFlowFileFirstPrioritizer*: Given two FlowFiles, the one that is oldest in the dataflow will be processed first. 'This is the default scheme that is used if no prioritizers are selected'.
- *OldestFlowFileFirstPrioritizer*: Given two FlowFiles, the one that is oldest in the dataflow will be processed first.
- *PriorityAttributePrioritizer*: Given two FlowFiles, an attribute called “priority” will be extracted. The one that has the lowest priority value will be processed first.
** Note that an UpdateAttribute processor should be used to add the "priority" attribute to the FlowFiles before they reach a connection that has this prioritizer set.
** If only one has that attribute it will go first.
** Values for the "priority" attribute can be alphanumeric, where "a" will come before "z" and "1" before "9"
** If "priority" attribute cannot be parsed as a long, unicode string ordering will be used. For example: "99" and "100" will be ordered so the FlowFile with "99" comes first, but "A-99" and "A-100" will sort so the FlowFile with "A-100" comes first.
In case no prioritizers are selected or the selected prioritizers do not differentiate between the compared FlowFiles,
processing order is not further specified but an implementation detail that might change between versions of NiFi.
NOTE: With a <<load_balance_strategy>> configured, the connection has a queue per node in addition to the local queue. The prioritizer will sort the data in each queue independently.
==== Changing Configuration and Context Menu Options