[eclipse-iceoryx#396] Update setting log level section

Signed-off-by: Ziad Mostafa <[email protected]>

FAQ.md

@@ -134,6 +134,20 @@ But you can also use a crate like [ctrlc](https://docs.rs/ctrlc/latest/ctrlc/).
 
 ## How to set the log level
 
+iceoryx2 gets the logging level from either the code, or the environment variable `IOX2_LOG_LEVEL`
+the developer can set this environment variable with one of the supported levels:
+```Trace, Debug, Info, Warning, Error, Fatal``` 
+
+`export IOX2_LOG_LEVEL=Trace`
+
+or via `.cargo/config.toml` 
+
+> [!NOTE]
+> Setting IOX2_LOG_LEVEL from terminal will take precedence over setting it 
+> from `.cargo/config.toml`.
+
+Developers can also set the logging level from within the code:
+
 ```rust
 use iceoryx2::prelude::*