Fix #2627, update check, docstr for max table sz

[irowebbn]

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Describe the contribution
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• Fixes TBL verify check for CFE_PLATFORM_TBL_MAX_SNGL_TABLE_SIZE does not match documented description #2627 by updating doctring in example config and updating preprocessor verification.

Testing performed
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1. Normal build and compile steps

Expected behavior changes
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• Allows a wider range of combinations for table size and table memory.

System(s) tested on

• Versions: cFE trunk

Contributor Info - All information REQUIRED for consideration of pull request
Isaac Rowe NASA JSC, JETS II contract

[irowebbn]

I understand that there is a new method to configure cFE that obviates the need for the headers. I was unable to find documentation on how to setup and run that. This PR does not address any necessary changes that would be needed for that method.

[irowebbn]

Also, this change implies that MAX_SIMULTANEOUS_LOADS can be set to 1. However, doing so breaks some old unit tests. I can address that in a follow-up PR.