docs: Mention reserved keywords in naming

Author: igorlukanin

docs/pages/product/data-modeling/syntax.mdx

@@ -77,8 +77,9 @@ for dynamic data modeling.
 
 Common rules apply to names of entities within the data model. All names must:
 
-- start with a letter
-- consist of letters, numbers, and underscore (`_`) symbols only
+- Start with a letter.
+- Consist of letters, numbers, and underscore (`_`) symbols only.
+- Not be a [reserved keyword in Python][link-python-reserved-words], e.g., `from`, `return`, or `yield`.
 
 It is also recommended that names use [snake case][wiki-snake-case].
 
@@ -776,3 +777,4 @@ defining dynamic data models.
 [ref-polymorphism]: /product/data-modeling/concepts/polymorphic-cubes
 [ref-data-blending]: /product/data-modeling/concepts/data-blending
 [link-js-template-literals]: https://developer.mozilla.org/en-US/docs/Learn_web_development/Core/Scripting/Strings#embedding_javascript
+[link-python-reserved-words]: https://docs.python.org/3/reference/lexical_analysis.html#keywords