Fix links in the manual

[ViralBShah]

Fix a couple of broken links in the manual. I am unable to track these four:

┌ Warning: invalid local link: unresolved path in base/arrays.md
│   link.text =
│    1-element Array{Any,1}:
│     Markdown.Code("", "^")
│   link.url = "math.html#Base.:^-Tuple{Number,Number}"
└ @ Documenter.Writers.HTMLWriter ~/julia/doc/deps/packages/Documenter/QQWIJ/src/Writers/HTMLWriter.jl:1676
┌ Warning: invalid local link: unresolved path in base/arrays.md
│   link.text =
│    1-element Array{Any,1}:
│     Markdown.Code("", "c^r")
│   link.url = "math.html#Base.:^-Tuple{Number,Number}"
└ @ Documenter.Writers.HTMLWriter ~/julia/doc/deps/packages/Documenter/QQWIJ/src/Writers/HTMLWriter.jl:1676
┌ Warning: invalid local link: unresolved path in base/base.md
│   link.text =
│    1-element Array{Any,1}:
│     Markdown.Code("", "one")
│   link.url = "../base/numbers.html#Base.one"
└ @ Documenter.Writers.HTMLWriter ~/julia/doc/deps/packages/Documenter/QQWIJ/src/Writers/HTMLWriter.jl:1676
┌ Warning: invalid local link: unresolved path in base/base.md
│   link.text =
│    1-element Array{Any,1}:
│     Markdown.Code("", "Float64")
│   link.url = "../base/numbers.html#Core.Float64"
└ @ Documenter.Writers.HTMLWriter ~/julia/doc/deps/packages/Documenter/QQWIJ/src/Writers/HTMLWriter.jl:1676

[ViralBShah]

@staticfloat The mac failure is weird. Is it possibly running out of space or a bad disk?