Added a comment

Author: teofr

crates/solidity-v2/inputs/language/src/definition.rs

@@ -763,6 +763,9 @@ PragmaDirective: PragmaDirective = {
                             identifier = Identifier,
                             definitions = [KeywordDefinition(
                                 // TODO(v2) removing conflict - fallback unreserved before 0.6.0 conflicts with FunctionName
+                                // Note: Leaving this commented from now, I think this should be enabled from 0.6.0,
+                                // together with the uses of it. Then it'll fall into the category of keywords
+                                // that are only used as keywords while reserved (a lot easier to solve)
                                 // reserved = From("0.6.0"),
                                 value = Atom("fallback")
                             )]