Merge branch 'sg/asciidoctor-in-ci'

Update our support to format documentation in the CI environment,
either with AsciiDoc ro Asciidoctor.

* sg/asciidoctor-in-ci:
  ci: fix AsciiDoc/Asciidoctor stderr check in the documentation build job
  ci: stick with Asciidoctor v1.5.8 for now
  ci: install Asciidoctor in 'ci/install-dependencies.sh'
  Documentation/technical/protocol-v2.txt: fix formatting
  Documentation/technical/api-config.txt: fix formatting
  Documentation/git-diff-tree.txt: fix formatting

1 files changed, 1 insertions, 1 deletions

diff --git a/Documentation/technical/api-config.txt b/Documentation/technical/api-config.txt
index fa39ac9d71..7d20716c32 100644
--- a/Documentation/technical/api-config.txt
+++ b/Documentation/technical/api-config.txt
@@ -229,7 +229,7 @@ A `config_set` can be used to construct an in-memory cache for
 config-like files that the caller specifies (i.e., files like `.gitmodules`,
 `~/.gitconfig` etc.). For example,
 
----------------------------------------
+----------------------------------------
 struct config_set gm_config;
 git_configset_init(&gm_config);
 int b;