Fix: Keep empty lines in discussion tree (#173)

* Docs: Fix typos and remove trailing spaces

* Fix: Split strings by new lines correctly

* Docs: Recommend breakindent option to improve tree nodes indentation

* Fix: Replace whole buffer when creating a new suggestion

Previously, a trailing empty line was left in the buffer.

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Co-authored-by: Jakub Bortlík <jakub.bortlik@phonexia.com>

lua/gitlab/actions/pipeline.lua

@@ -148,7 +148,7 @@ M.see_logs = function()
     end
 
     local lines = {}
-    for line in file:gmatch("[^\n]+") do
+    for line in u.split_by_new_lines(file) do
       table.insert(lines, line)
     end