[conv.array] Fix decay index redirects. (#1908)

Author: Eelis

source/conversions.tex

@@ -194,8 +194,8 @@
 
 \pnum
 \indextext{conversion!array-to-pointer}%
-\indextext{decay!array|see{conversion, array to pointer}}%
-\indextext{decay!function|see{conversion, function to pointer}}%
+\indextext{decay!array|see{conversion, array-to-pointer}}%
+\indextext{decay!function|see{conversion, function-to-pointer}}%
 An lvalue or rvalue of type ``array of \tcode{N} \tcode{T}'' or ``array
 of unknown bound of \tcode{T}'' can be converted to a prvalue of type
 ``pointer to \tcode{T}''.