Make better use of highlighting code keywords and values in Markdown

[scarletfog]

Description

Having everything set up we can find places that could be improved in terms of styling. Here is the base list:

• Mark default values with a color/different style/wording/label so they can be more distinctive in the text.
• Mark the sentence about recalculation: Note about recalculation should have a different style (maybe special tag? @recalculates and add it automatically) and it should mention that Volatile functions are recalculated always i.e. =RAND().