Rework help message

Signed-off-by: Sasha Pourcelot <[email protected]>

Author: scrabsha

compiler/rustc_parse/messages.ftl

@@ -232,7 +232,7 @@ parse_expected_trait_in_trait_impl_found_type = expected a trait, found type
 
 parse_expr_rarrow_call = `->` used for field access or method call
     .suggestion = try using `.` instead
-    .help = Rust uses `.` to access fields and methods
+    .help = The `.` operator dereferences the value if needed
 
 parse_extern_crate_name_with_dashes = crate name using dashes are not valid in `extern crate` statements
     .label = dash-separated idents are not valid