Update misc.md

Author: JamesH65

configuration/config-txt/misc.md

@@ -1,16 +1,16 @@
-## Miscellaneous config.txt options
+# Miscellaneous options in config.txt
 
-### avoid_warnings
+## avoid_warnings
 
 The [warning symbols](../warning-icons.md) can be disabled using this option, although this is not advised.
 
 `avoid_warnings=1` disables the warning overlays.
 `avoid_warnings=2` disables the warning overlays, but additionally allows turbo mode even when low-voltage is present.
 
-### logging_level
+## logging_level
 
 Sets the Videocore logging level. The value is a Videocore-specific bitmask.
 
-### arm_64bit
+## arm_64bit
 
 If set, this forces the kernel loading system to assume a 64-bit kernel.