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[Docs] Clarify layer transparency keymap.md (#9081)

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* Revised the grammar and clarity of the Layer Precedence and Transparency

* Update docs/keymap.md

* Update docs/keymap.md

* Update docs/keymap.md

* Update docs/keymap.md

* Update docs/keymap.md

* Update docs/keymap.md

* Update docs/keymap.md
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@ -71,10 +71,22 @@ On the other hand, you can change `layer_state` to overlay the base layer with o
### Layer Precedence and Transparency
Note that ***higher layer has higher priority on stack of layers***, namely firmware falls down from top layer to bottom to look up keycode. Once it spots keycode other than **`KC_TRNS`**(transparent) on a layer it stops searching and lower layers aren't referred.
Note that ***higher layers have higher priority within the stack of layers***. The firmware works its way down from the highest active layers to look up keycodes. Once the firmware locates a keycode other than `KC_TRNS` (transparent) on an active layer, it stops searching, and lower layers aren't referenced.
You can place `KC_TRANS` on overlay layer changes just part of layout to fall back on lower or base layer.
Key with `KC_TRANS` (`KC_TRNS` and `_______` are the alias) doesn't has its own keycode and refers to lower valid layers for keycode, instead.
____________
/ / <--- Higher layer
/ KC_TRNS //
/___________// <--- Lower layer (KC_A)
/___________/
In the above scenario, the non-transparent keys on the higher layer would be usable, but whenever `KC_TRNS` (or equivalent) is defined, the keycode (`KC_A`) on the lower level would be used.
**Note:** Valid ways to denote transparency on a given layer:
* `KC_TRANSPARENT`
* `KC_TRNS` (alias)
* `_______` (alias)
These keycodes allow the processing to fall through to lower layers in search of a non-transparent keycode to process.
## Anatomy of a `keymap.c`