Update a comment [ci skip]

l3kernel/l3str.dtx

@@ -1102,9 +1102,8 @@
 %   is that we do not \emph{always} use the primitive, the correct approach
 %   is to wrap up in a function with defined behaviour. That's done by
 %   providing a wrapper and then redefining in the \LuaTeX{} case. Note that
-%   the necessary Lua code is covered in \pkg{l3boostrap}: long-term this may
-%   need to go into a separate Lua file, but at present it's somewhere that
-%   spaces are not skipped for ease-of-input. The need to detokenize and force
+%   the necessary Lua code is loaded in \pkg{l3boostrap}.
+%   The need to detokenize and force
 %   expansion of input arises from the case where a |#| token is used in the
 %   input, \emph{e.g.}~|\__str_if_eq_x:nn {#} { \tl_to_str:n {#} }|, which
 %   otherwise would fail as \cs{luatex_luaescapestring:D} does not double