Let floatx and complexx use convert. Fix similar for sparse matrices.
Fix for juliadoc package being out of scope.
Merge pull request #6090 from Ismael-VC/sphinx_fix

RFC: Fix for juliadoc package being out of scope.
fix a screwup I made in bec200eb80eb3bf690138cc1601561fdd17936c4

this fixes the ambiguity warnings in PR #6078
Merge branch 'master' of github.com:JuliaLang/julia
Merge pull request #6078 from JuliaLang/anj/sparse2

Let floatx and complexx use convert. Fix similar for sparse matrices.