docs/phonemes.md: restructure the consonant release features.

docs/phoneme_model.md

 - [Rounding and Labialization](#rounding-and-labialization)
   - [Vowel Rounding](#vowel-rounding)
 - [Syllabicity](#syllabicity)
+- [Consonant Release](#consonant-release)
 - [References](#references)
 
 ----------
 | `syl`   | syllabic     |
 | `nsy`   | non-syllabic |
 
+## Consonant Release
+
+| Feature | Name                            |
+|---------|---------------------------------|
+| `frr`   | fricative release               |
+| `asp`   | aspirated                       |
+| `nrs`   | nasal release                   |
+| `lrs`   | lateral release                 |
+| `unx`   | no audible release (unexploded) |
+
 ## References
 
 1. <a name="ref1"></a> Kirshenbaum, Evan,

docs/phonemes.md

   - [Phonation](#phonation)
   - [Rounding and Labialization](#rounding-and-labialization)
   - [Syllabicity](#syllabicity)
-- [Features](#features)
   - [Consonant Release](#consonant-release)
+- [Features](#features)
   - [Fortis and Lenis](#fortis-and-lenis)
   - [Co-articulation](#co-articulation-1)
   - [Suprasegmentals](#suprasegmentals)
 | `syl`   | ◌̩      | syllabic        |
 | `nsy`   | ◌̯      | non-syllabic    |
 
-## Features
-
 ### Consonant Release
 
 | Feature | Symbol | Name                            |
 |---------|--------|---------------------------------|
-| `frr`   |        | fricative release               |
 | `asp`   | ◌ʰ     | aspirated                       |
 | `nrs`   | ◌ⁿ     | nasal release                   |
 | `lrs`   | ◌ˡ     | lateral release                 |
 | `unx`   | ◌̚      | no audible release (unexploded) |
 
+## Features
+
 ### Co-articulation
 
 | Feature | Symbol | Name            | Co-Articulator | Type                  |