Ocamlformat 0.14.2

Changes

• Merge doc-comments-val option with doc-comments. The placement of documentation comments on val and external items is now controled by doc-comments.
  • doc-comments=after becomes doc-comments=after-when-possible to take into account the technical limitations of ocamlformat;
  • doc-comments=before is unchanged;
  • doc-comments-val is now replaced with doc-comments. To reproduce the former behaviors
    • doc-comments=before + doc-comments-val=before: now use doc-comments=before;
    • doc-comments=before + doc-comments-val=after: now use doc-comments=before-except-val;
    • doc-comments=after + doc-comments-val=before: this behavior did not make much sense and is not available anymore;
    • doc-comments=after + doc-comments-val=after: now use doc-comments=after-when-possible. (#1358, @jberdine, @Julow, @gpetiot). This reverts changes introduced in 0.14.1 (#1335) and 0.14.0 (#1012).