docs(hold-tap): mark tapping_term_ms as code

Improves readability and consistency.

docs/docs/behaviors/hold-tap.md

@@ -23,9 +23,9 @@ We call this the 'hold-preferred' flavor of hold-taps. While this flavor may wor
 
 #### Flavors
 
-- The 'hold-preferred' flavor triggers the hold behavior when the tapping_term_ms has expired or another key is pressed.
-- The 'balanced' flavor will trigger the hold behavior when the tapping_term_ms has expired or another key is pressed and released.
-- The 'tap-preferred' flavor triggers the hold behavior when the tapping_term_ms has expired. It triggers the tap behavior when another key is pressed.
+- The 'hold-preferred' flavor triggers the hold behavior when the `tapping_term_ms` has expired or another key is pressed.
+- The 'balanced' flavor will trigger the hold behavior when the `tapping_term_ms` has expired or another key is pressed and released.
+- The 'tap-preferred' flavor triggers the hold behavior when the `tapping_term_ms` has expired. It triggers the tap behavior when another key is pressed.
 
 When the hold-tap key is released and the hold behavior has not been triggered, the tap behavior will trigger.
 
@@ -68,7 +68,7 @@ This example configures a hold-tap that works well for homerow mods:
 
 ```
 
-If this config does not work for you, try the flavor "balanced" with a medium tapping_term_ms such as 200ms.
+If this config does not work for you, try the flavor "balanced" with a medium `tapping_term_ms` such as 200ms.
 
 #### Comparison to QMK