remove "Known problems" of verbose_bit_mask (#14137)

changelog: none

Author: llogiq

clippy_lints/src/operators/mod.rs

@@ -265,9 +265,6 @@ declare_clippy_lint! {
     /// `x.trailing_zeros() >= 4` is much clearer than `x & 15
     /// == 0`
     ///
-    /// ### Known problems
-    /// llvm generates better code for `x & 15 == 0` on x86
-    ///
     /// ### Example
     /// ```no_run
     /// # let x = 1;