Temporarily remove link to fix building docs

Author: nalimilan

base/strings/substring.jl

@@ -128,7 +128,7 @@ end
 Reverses a string. Technically, this function reverses the codepoints in a string and its
 main utility is for reversed-order string processing, especially for reversed
 regular-expression searches. See also [`reverseind`](@ref) to convert indices in `s` to
-indices in `reverse(s)` and vice-versa, and [`Unicode.graphemes`](@ref Unicode.graphemes) to
+indices in `reverse(s)` and vice-versa, and `Unicode.graphemes` to
 operate on user-visible "characters" (graphemes) rather than codepoints.
 See also [`Iterators.reverse`](@ref) for
 reverse-order iteration without making a copy. Custom string types must implement the