DOCSP-26952 standardize on ID (#134)

* DOCSP-26952 standardize on ID

* Review feedback

Author: Dave Cuthbert

source/style-guide/style/capitalization.txt

@@ -94,6 +94,10 @@ Following are some examples.
    * - GHz
      - gigahertz
 
+   * - ID
+     - | identification
+       | Note: `_id` is never capitalized.
+
    * - I/O
      - input/output
 
@@ -117,7 +121,8 @@ Following are some examples.
 
 .. seealso::
 
-   To learn more, see :ref:`abbreviations`.
+   To learn more, and for a list of common abbreviations, see
+   :ref:`abbreviations`.
 
 Capitalize Job Titles when Used as Titles
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