[indirectcallable.indirectinvocable] Remove stray "&".

This was an error in the application of P2609R3.

Author: tkoeppe

Diff for: source/iterators.tex

@@ -2483,7 +2483,7 @@
       @\libconcept{copy_constructible}@<F> &&
       @\libconcept{equivalence_relation}@<F&, @\exposid{indirect-value-t}@<I1>, @\exposid{indirect-value-t}@<I2>> &&
       @\libconcept{equivalence_relation}@<F&, @\exposid{indirect-value-t}@<I1>, iter_reference_t<I2>> &&
-      @\libconcept{equivalence_relation}@<F&, iter_reference_t<I1>, @\exposid{indirect-value-t}@<I2>&> &&
+      @\libconcept{equivalence_relation}@<F&, iter_reference_t<I1>, @\exposid{indirect-value-t}@<I2>> &&
       @\libconcept{equivalence_relation}@<F&, iter_reference_t<I1>, iter_reference_t<I2>> &&
       @\libconcept{equivalence_relation}@<F&, iter_common_reference_t<I1>, iter_common_reference_t<I2>>;