Update usage-dictionary.mdx

Added description of e words and how we will spell them going forward.

src/content/docs/style-guide/word-choice/usage-dictionary.mdx

@@ -430,6 +430,13 @@ Really, we recommend being as specific as possible to establish context. If a pi
     * It's important to understand how the concept of "event" can overlap with the concept of "metric." Both are broad general terms and due to that there can be some overlap in meaning. Because metrics are just measurements, all New Relic data (events, spans, logs) can be said to be or contain metrics. For example, the events reported by our infrastructure monitoring contain various metrics, which are simply numeric measurements of various kinds ([read more about infrastructure events containing metrics](/docs/data-apis/understand-data/new-relic-data-types/#metric-event-attributes)).
   </Collapser>
 
+<Collapser
+    id="e words"
+    title="e words"
+  >
+    E words will be one word with no hyphen and no unusual capitalization. For example, ebook, ecommerce, and email. Treat e words like common nouns; that is, the "e" will be capitalized at the beginning of a sentence, headline, etc.
+  </Collapser>
+
 <Collapser
     id="frontend"
     title="frontend"