Update professions.md

Author: dedmemdev

docs/en/mod/json/reference/professions.md

@@ -100,7 +100,7 @@ You are trained to an expert degree and have years of experience of experience a
 Example: A professional athlete would have 10 in athletics. A tier one spec ops would have 10 in marksmanship. A high profile chemist would have 10 in cooking.
 
 11: LEGENDARY
-You are a standout within your field even amongst the best. You are famous, or infamous, for your skill within your field.
+You are a standout within your field even amongst the best. You are famous, or infamous, for your skill within your field. Note that this skill level is normally unachievable through levelling in game, and thus this should be reserved for professions that represent truly exceptional individuals.
 Example: An olympic medalist would have 11 in athletics. A nobel prize chemist would have 11 in cooking.
 
 ## Profession Item Substitutions