removed double title, added description header, added colons to headers, spaced things and colorized example.

skills/mechanics/shieldpercent.md

-Mechanic: ShieldPercent
 =======================
 
+## Description:
+
 Applies an absorb shield to the target entity for a percentage of their
 max health.  
 Doesn't work on **Minecraft below 1.13**(excluding 1.13).
 
-Attributes
-----------
+## Attributes:
 
 | Attribute  | Aliases           | Description | Default Value      |
 |------------|-------------------|-------------|--------------------|
 | multiplier | m                 |             | 0.1                |
 | maxabsorb  | maxshield, ma, ms |             | Multiplier's value |
 
-  
-
-Examples
---------
-
-      Skills:
+## Examples:
+Adds shield absorption hearts to caster with a multiplier.
+```yaml
+Skills:
   - shieldPercent{multiplier=2;mS=2.5} @self ~onTimer:2000
   - ...
+```
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