add warning for inifile loader
address comments, even the Boolean one
address comments
minor #3431 [Config] add cautionary note on ini file loader limitation (cordoval)

This PR was merged into the 2.3 branch.

Discussion
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[Config] add cautionary note on ini file loader limitation

| Q             | A                   |
| ---           | ---                 |
| Doc fix?      | yes                 |
| New docs?     | no                  |
| Applies to    | 2.3+                |
| Fixed tickets | #2517               |
| License       | CC-ASA 3.0 Unported |

 Sent using [Gush](https://github.com/cordoval/gush)

Commits
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4f02a8a address comments
dd3dd70 address comments, even the Boolean one
4436dae add warning for inifile loader