Indentation and grammar (#19209)

* Indentation and grammar

- I added a sentence about indentation, which is essential for the code to be contained in the function
- Neatened up the grammar in the list.

* Remove commas

client/src/pages/guide/english/python/functions/index.md

@@ -17,9 +17,9 @@ In Python, a function definition has the following features:
 
 1. The keyword `def`
 2. a function name
-3. paranthesis'()', and within paranthesis input parameters,although the input parameters are optional.
+3. paranthesis'()', and within paranthesis input parameters,although the input parameters are optional
 4. a colon ':'
-5. some block of code to execute
+5. some block of code to execute (that must be indented relative to the definition statement)
 6. a return statement (optional)
 
 ```python