nitpick: Fix syntax for appendConfigData() in .coderabbit.yaml

Corrected formatting and syntax for appendConfigData() reference.

Author: softhack007

.coderabbit.yaml

@@ -130,8 +130,8 @@ reviews:
         #ifdef). Usermods do not use library.json. Follow the same C++ conventions
         as the core firmware (docs/cpp.instructions.md).
 
-        If the usermod implements `appendConfigData()`, check that the buffer usage (`oappend`) 
-        leaves some margin w.r.t. SETTINGS_STACK_BUF_SIZE on esp32.
+        If the usermod implements `appendConfigData()`, check that the buffer usage (`oappend()`) 
+        leaves some margin w.r.t. `SETTINGS_STACK_BUF_SIZE` on esp32.
 
         If I2C is needed, verify that `pinManager.joinWire()` is used instead of `Wire.begin()`. I2C is shared between all usermods in WLED-MM.