chore: fix some typos in comments

Signed-off-by: fanqiaojun <fanqiaojun@yeah.net>

lib/docs/filters/elisp/entries.rb

@@ -2,7 +2,7 @@ module Docs
   class Elisp
     class EntriesFilter < Docs::EntriesFilter
       def get_name
-        # remove numbers at the beginnig
+        # remove numbers at the beginning
         name = at_css('.chapter', '.section', '.subsection', '.subsubsection', '.appendix').content.slice(/[[:alpha:]]...*/)
 
         # remove 'Appendix' word

lib/docs/filters/gtk/entries.rb

@@ -4,7 +4,7 @@ module Docs
       # The GTK documentation paths are "flat" and while the contents of each
       # page provides a way to determine the direct parent relationship, we
       # really need a full hierarchy of pages *a priori* to be able to fully
-      # categorize all pages and entries. So we're going to recursivly generate
+      # categorize all pages and entries. So we're going to recursively generate
       # a full map of page -> parent relationships from the table of contents...
       PARENT_BY_PATH = {}
 

lib/docs/filters/kubectl/entries.rb

@@ -15,7 +15,7 @@ module Docs
         group = 'kubectl'
         commands = css('h1').to_a()
         commands.map do |node|
-          # handle titles differnetly by converting them into sidebar groups (types)
+          # handle titles differently by converting them into sidebar groups (types)
           new_group = at_css("##{node['id']} > strong")
           if new_group
             group = new_group.content.titleize