Update CODINGSTYLE.md

Spotted some minor typos, improved some wordings

CODINGSTYLE.md

@@ -99,7 +99,7 @@ foo_bar="$foo"
 ```
 
 ## Subshell usage
-Use `$()` syntax, not backticks, as backticks are harder to spot.
+Use `$()` syntax, not backticks.
 
 ## Sorting
 Some items tend to benefit from being sorted. A list of sources, dependencies