Remove entire note on 128 bytes being too small

The point it was making was:
1) Fairly hard to explain
2) Not necessarily true

Author: DJMcNab

fearless_simd_core/src/lib.rs

@@ -193,12 +193,6 @@ pub unsafe trait TargetFeatureToken: Copy {
 /// trampoline!(Token = token => "f1,f2", uses_simd(a: [f32; 4]) -> [f32; 4])
 /// ```
 ///
-/// Note that a function only operating on 128 bytes is probably too small for checking
-/// whether a token exists just for it is worthwhile.
-/// However, if you have amorphised the cost of that check between many function calls,
-/// the `trampoline!` macro itself compiles down to a function call.
-/// (This would be the case when this macro is being used to implement the portable subset of SIMD operations)
-///
 // TODO: We could write an example for each of ARM, x86, and conditionally compile it in?
 /// Note that our examples are all ignored as there is no target feature which is available on every platform,
 /// but we need these docs to compile for users on any platform.