minor #3431 [Config] add cautionary note on ini file loader limitatio…

…n (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 |

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

components/config/introduction.rst

@@ -12,6 +12,13 @@ The Config component provides several classes to help you find, load, combine,
 autofill and validate configuration values of any kind, whatever their source
 may be (YAML, XML, INI files, or for instance a database).
 
+.. caution::
+
+    The ``IniFileLoader`` parses the file contents using the
+    :phpfunction:`parse_ini_file` function, therefore, you can only set
+    parameters to string values. To set parameters to other data types
+    (e.g. boolean, integer, etc), the other loaders are recommended.
+
 Installation
 ------------