Add section on English natural language text

Includes addressing review comment by Hans regarding contractions.
phannebohm · Mar 20, 2021 · c18233f · c18233f
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diff --git a/styleguide.md b/styleguide.md
@@ -210,3 +210,13 @@ When a grammar rule is mentioned in the text, the rule shall be formatted with t
 ```
 The node shall contain a \lstinline[language=grammar]!stored-definition! that…
 ```
+
+## English natural language text
+
+This section gives guidelines for how the natural language text in English should be written.
+
+The text is written in American English.
+
+### Contractions
+
+Avoid contractions such as _isn't_ or _won't_; write _is not_ or _will/would not_ instead.