remove obsolete and incorrect comment

src/libsyntax/parse/lexer/mod.rs

@@ -446,9 +446,7 @@ impl<'a> StringReader<'a> {
         self.with_str_from_to(start, self.pos, f)
     }
 
-    /// Creates a Name from a given offset to the current offset, each
-    /// adjusted 1 towards each other (assumes that on either side there is a
-    /// single-byte delimiter).
+    /// Creates a Name from a given offset to the current offset.
     fn name_from(&self, start: BytePos) -> ast::Name {
         debug!("taking an ident from {:?} to {:?}", start, self.pos);
         self.with_str_from(start, Symbol::intern)