Use julia-repl in documentation

With the highlighting updates in Documenter v0.10.1 it is now possible
to have specialized highlighting for REPL blocks via the julia-repl
attribute on code blocks. Doctests already use this, so this makes the
highlighting for non-doctest REPL blocks consistent.

(cherry picked from commit 014c5d5)
ref #21866

Use at-repl for versioninfo() output

(cherry picked from commit f67d4fd)

Enable highlighting in the manual

A couple of code examples were not highlighted for some reason.

(cherry picked from commit b710de9)

Remove highlighting from REQUIRE code

These blocks are not Julia code, but special REQUIRE file syntax
instead.

(cherry picked from commit c90c17f)

Enable bash highlighting

Also add a newline to the end of the file.

(cherry picked from commit 6e08c18)

Use a non-deprecated package in an example

UTF16.jl has been deprecated for a while. Use SHA.jl instead as the
example.

(cherry picked from commit 6e5c55d)

Edit manual/conversion-and-promotion.md

The REPL example is basically exactly as above, and does not add
anything to the latter bit about the actual convert methods.

(cherry picked from commit 96b65f1)

Fix line numbers in doctests

(cherry picked from commit 814a8a1)

Enable a doctest in base/regex.jl

(cherry picked from commit d9063cb)

Enable doctests the the manual

Switching to julia-repl revealed several code blocks that could
trivially be turned into doctests.

(cherry picked from commit 1d20519)

Author: mortenpi

base/abstractarray.jl

@@ -489,7 +489,7 @@ default is an `Array{element_type}(dims...)`.
 For example, `similar(1:10, 1, 4)` returns an uninitialized `Array{Int,2}` since ranges are
 neither mutable nor support 2 dimensions:
 
-```julia
+```julia-repl
 julia> similar(1:10, 1, 4)
 1×4 Array{Int64,2}:
  4419743872  4374413872  4419743888  0
@@ -498,7 +498,7 @@ julia> similar(1:10, 1, 4)
 Conversely, `similar(trues(10,10), 2)` returns an uninitialized `BitVector` with two
 elements since `BitArray`s are both mutable and can support 1-dimensional arrays:
 
-```julia
+```julia-repl
 julia> similar(trues(10,10), 2)
 2-element BitArray{1}:
  false
@@ -508,7 +508,7 @@ julia> similar(trues(10,10), 2)
 Since `BitArray`s can only store elements of type `Bool`, however, if you request a
 different element type it will create a regular `Array` instead:
 
-```julia
+```julia-repl
 julia> similar(falses(10), Float64, 2, 4)
 2×4 Array{Float64,2}:
  2.18425e-314  2.18425e-314  2.18425e-314  2.18425e-314

base/array.jl

@@ -718,7 +718,7 @@ julia> resize!([6, 5, 4, 3, 2, 1], 3)
  4
 ```
 
-```julia
+```julia-repl
 julia> resize!([6, 5, 4, 3, 2, 1], 8)
 8-element Array{Int64,1}:
  6

base/bitarray.jl

@@ -35,7 +35,7 @@ end
 Construct an uninitialized `BitArray` with the given dimensions.
 Behaves identically to the [`Array`](@ref) constructor.
 
-```julia
+```julia-repl
 julia> BitArray(2, 2)
 2×2 BitArray{2}:
  false  false

base/distributed/pmap.jl

@@ -60,7 +60,7 @@ which is then returned inline with the results to the caller.
 
 Consider the following two examples. The first one returns the exception object inline,
 the second a 0 in place of any exception:
-```julia
+```julia-repl
 julia> pmap(x->iseven(x) ? error("foo") : x, 1:4; on_error=identity)
 4-element Array{Any,1}:
  1

base/docs/helpdb/Base.jl

@@ -1949,7 +1949,7 @@ julia> convert(Int, 3.0)
 julia> convert(Int, 3.5)
 ERROR: InexactError()
 Stacktrace:
- [1] convert(::Type{Int64}, ::Float64) at ./float.jl:679
+ [1] convert(::Type{Int64}, ::Float64) at ./float.jl:680
 ```
 
 If `T` is a `AbstractFloat` or `Rational` type,

base/libgit2/libgit2.jl

@@ -75,7 +75,7 @@ is in the repository.
 
 # Example
 
-```julia
+```julia-repl
 julia> repo = LibGit2.GitRepo(repo_path);
 
 julia> LibGit2.add!(repo, test_file);
@@ -220,7 +220,7 @@ Returns `true` if `a`, a [`GitHash`](@ref) in string form, is an ancestor of
 
 # Example
 
-```julia
+```julia-repl
 julia> repo = LibGit2.GitRepo(repo_path);
 
 julia> LibGit2.add!(repo, test_file1);
@@ -954,4 +954,3 @@ end
 
 
 end # module
-

base/libgit2/reference.jl

@@ -48,7 +48,7 @@ end
 Returns a shortened version of the name of `ref` that's
 "human-readable".
 
-```julia
+```julia-repl
 julia> repo = LibGit2.GitRepo(path_to_repo);
 
 julia> branch_ref = LibGit2.head(repo);

base/libgit2/remote.jl

@@ -78,7 +78,7 @@ Get the URL of a remote git repository.
 
 # Example
 
-```julia
+```julia-repl
 julia> repo_url = "https://github.com/JuliaLang/Example.jl";
 
 julia> repo = LibGit2.clone(cache_repo, "test_directory");
@@ -104,7 +104,7 @@ the name will be an empty string `""`.
 
 # Example
 
-```julia
+```julia-repl
 julia> repo_url = "https://github.com/JuliaLang/Example.jl";
 
 julia> repo = LibGit2.clone(cache_repo, "test_directory");
@@ -158,7 +158,7 @@ Add a *fetch* refspec for the specified `rmt`. This refspec will contain
 information about which branch(es) to fetch from.
 
 # Example
-```julia
+```julia-repl
 julia> LibGit2.add_fetch!(repo, remote, "upstream");
 
 julia> LibGit2.fetch_refspecs(remote)
@@ -178,7 +178,7 @@ Add a *push* refspec for the specified `rmt`. This refspec will contain
 information about which branch(es) to push to.
 
 # Example
-```julia
+```julia-repl
 julia> LibGit2.add_push!(repo, remote, "refs/heads/master");
 
 julia> remote = LibGit2.get(LibGit2.GitRemote, repo, branch);

base/multidimensional.jl

@@ -903,7 +903,7 @@ their indices; any offset results in a (circular) wraparound. If the
 arrays have overlapping indices, then on the domain of the overlap
 `dest` agrees with `src`.
 
-```julia
+```julia-repl
 julia> src = reshape(collect(1:16), (4,4))
 4×4 Array{Int64,2}:
  1  5   9  13

base/regex.jl

@@ -75,7 +75,7 @@ after the ending quote, to change its behaviour:
 
 For example, this regex has all three flags enabled:
 
-```julia
+```jldoctest
 julia> match(r"a+.*b+.*?d\$"ism, "Goodbye,\\nOh, angry,\\nBad world\\n")
 RegexMatch("angry,\\nBad world")
 ```