fixup: remove \irefs which weren't in the proposal

Author: dietmarkuehl

source/exec.tex

@@ -5728,7 +5728,7 @@
 except that \tcode{sndr} is evalutated only once.
 
 \pnum
-The exposition-only class template \exposid{impls-for}\iref{exec.snd.general}
+The exposition-only class template \exposid{impls-for}
 is specialized for \tcode{affine_on_t} as follows:
 
 \begin{codeblock}
@@ -6095,7 +6095,7 @@
 
 \pnum
 \tcode{allocator_type} shall meet the \oldconcept{Allocator}
-requirements\iref{allocator.requirements.general}.
+requirements.
 
 \rSec3[task.members]{\tcode{task} Members}