minor #11685 Added a section about belittling words to the documentation standars (Toflar)

This PR was squashed before being merged into the 3.4 branch (closes #11685).

Discussion
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Added a section about belittling words to the documentation standars

We already got rid of loads of these words as initiated by symfony/diversity#9. However, I couldn't see this was mentioned anywhere in the docs yet so I tried to fix this 😄

Commits
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edad658 Added a section about belittling words to the documentation standars

Author: javiereguiluz

contributing/documentation/standards.rst

@@ -175,6 +175,24 @@ In addition, documentation follows these rules:
   * his or hers, use theirs
   * himself or herself, use themselves
 
+* **Avoid belittling words**: People read documentation because they know very little about
+   a specific topic or are even completely new to it. Things that seem "obvious" or "simple"
+   for the person documenting it, can be the exact opposite for the reader. To make sure everybody
+   feels comfortable when reading the documentation, try to avoid words like:
+
+  * simply
+  * just
+  * easy/easily
+  * quick/quickly
+  * of course
+  * logically
+  * clearly
+  * obviously
+  * merely
+  * basically
+  * trivial
+
+
 .. _`the Sphinx documentation`: http://sphinx-doc.org/rest.html#source-code
 .. _`Twig Coding Standards`: https://twig.symfony.com/doc/2.x/coding_standards.html
 .. _`reserved by the IANA`: http://tools.ietf.org/html/rfc2606#section-3