Markdown for code fences in comments via backticks might produce invalid html

[kevlar700]

https://forum.ada-lang.io/t/the-new-gnatdoc-is-available-lets-create-a-docs-ada-dev-website-mabye/118/43

Opening an issue as requested by @godunko

The following comment ran through gnatdoc

-- Z85_Alphabet : constant BToA.Alphabet_85 := -- "0123456789" & -- "abcdefghij" & -- "klmnopqrst" & -- "uvwxyzABCD" & -- "EFGHIJKLMN" & -- "OPQRSTUVWX" & -- "YZ.-:+=^!/" & -- "*?&<>()[]{" & -- "}@%$#";

produces the following line

Z85_Alphabet : constant BToA.Alphabet_85 := "0123456789" & "abcdefghij" & "klmnopqrst" & "uvwxyzABCD" & "EFGHIJKLMN" & "OPQRSTUVWX" & "YZ.-:+=^!/" & "*?&<>()[]{" & "}@%$#";

Should backticks in a comment keep the line formatting but collapse the lines or keep it formatted as shown in the comment?

[kevlar700]

I guess this is doing what it should as Github looks similar even if it isn't what I wanted. Also not entirely sure that this is the possible issue that @godunko meant by

"Backticks generates probably incorrect HTML, can you please open an issue on GH?"

-- ''' Z85_Alphabet : constant BToA.Alphabet_85 :=
-- "0123456789" &
-- "abcdefghij" &
-- "klmnopqrst" &
-- "uvwxyzABCD" &
-- "EFGHIJKLMN" &
-- "OPQRSTUVWX" &
-- "YZ.-:+=^!/" &
-- "*?&<>()[]{" &
-- "}@%$#"; '''

(backticks replaced with apostrophe to keep the new lines)

[godunko]

--  ``` Z85_Alphabet : constant BToA.Alphabet_85 :=
--     "}@%$#"; ```

is incorrect, only language name can be present at the same line with opening ```

Correct use is

--  ```
--  Z85_Alphabet : constant BToA.Alphabet_85 :=
--     "}@%$#"; 
--  ```

and it produce just <code>...</code>, but should produce <pre><code>...</code></pre>