Fix comments

Author: DilumAluthge

test/read_only_api_tests.jl

@@ -90,14 +90,14 @@ end
         comparison_1 = compare(ghjl, "master", "master~"; auth = auth)
         comparison_2 = compare(ghjl, "master~", "master"; auth = auth)
 
-        @test_skip comparison_1.behind_by == 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
-        @test      comparison_1.behind_by >= 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
+        @test_skip comparison_1.behind_by == 1 # TODO FIXME: #228
+        @test      comparison_1.behind_by >= 1 # TODO FIXME: #228
 
-        @test_skip comparison_2.ahead_by == 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
-        @test      comparison_2.ahead_by >= 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
+        @test_skip comparison_2.ahead_by == 1 # TODO FIXME: #228
+        @test      comparison_2.ahead_by >= 1 # TODO FIXME: #228
 
-        @test_skip length(comparison_2.commits) == 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
-        @test      length(comparison_2.commits) >= 1 # TODO FIXME: https://github.com/JuliaWeb/GitHub.jl/issues/228
+        @test_skip length(comparison_2.commits) == 1 # TODO FIXME: #228
+        @test      length(comparison_2.commits) >= 1 # TODO FIXME: #228
     end
 
     let