Revert "Describe the additional Cainteoir Text-to-Speech phonemes for the articulation diacritics."

This reverts commit 39994150ba.

docs/phonemes.md

 
 ### Articulation
 
-The following articulation features are used by eSpeak NG to describe place of
-articulation features not in the main consonant tables.
-
 | Feature | Symbol | Name            | Origin        |
 |---------|--------|-----------------|---------------|
 | `lgl`   | ◌̼      | linguolabial    | `cainteoir`   |
 | `idt`   | ◌̪͆      | interdental     | `espeak-ng`   |
+|         | ◌̪      | dental          |               |
 | `apc`   | ◌̺      | apical          | `espeak-ng`   |
 | `lmn`   | ◌̻      | laminal         | `cainteoir`   |
-
-The following articulation features control the location on the IPA chart. As
-such, the phonemes are described in their new location on the IPA chart after
-applying the articulation diacritic. These diacritics are recorded in the
-Cainteoir Text-to-Speech program to provide accurate round-tripping between
-different phoneme transcriptions.
-
-| Feature | Symbol | Name            | Origin        |
-|---------|--------|-----------------|---------------|
-| `dzd`   | ◌̪      | dental          | `cainteoir`   |
-| `adv`   | ◌̟      | advanced        | `cainteoir`   |
-| `ret`   | ◌̠      | retracted       | `cainteoir`   |
-| `czd`   | ◌̈      | centralized     | `cainteoir`   |
-| `mcz`   | ◌̽      | mid-centralized | `cainteoir`   |
-| `rsd`   | ◌̝      | raised          | `cainteoir`   |
-| `lwr`   | ◌̞      | lowered         | `cainteoir`   |
+|         | ◌̟      | advanced        |               |
+|         | ◌̠      | retracted       |               |
+|         | ◌̈      | centralized     |               |
+|         | ◌̽      | mid-centralized |               |
+|         | ◌̝      | raised          |               |
+|         | ◌̞      | lowered         |               |
+
+The articulations that do not have a corresponding feature name are recorded
+using the features of their new location in the consonant or vowel charts, not
+using the features of the base phoneme.
 
 ### Air Flow