remove tone of voice

Author: martinbonnin

STYLE_GUIDE.md

@@ -90,16 +90,3 @@ For important terms, use [Spec Markdown definition paragraphs](https://spec-md.c
 Definition paragraphs start with `::` and add the matching italicized term to the
 [specification index](https://spec.graphql.org/draft/#index), making it easy to
 reference them.
-
-## Tone of voice
-
-The GraphQL specification is a reference document and should use neutral and
-descriptive tone of voice.
-
-Favor the present tense. The present tense is usually clearer and shorter:
-
-✅ Present: The client then sends a request to the server.
-❌ Future: The client will then send a request to the server.
-
-Avoid repetition. Repetition adds more cognitive load and possibilities for different
-parts of the specification to diverge in their meaning.