Address PR feedback: better variable name and regex simplification

Co-authored-by: dscho <127790+dscho@users.noreply.github.com>

Author: Copilot

script/update-docs.rb

@@ -174,16 +174,16 @@ def index_l10n_doc(filter_tags, doc_list, get_content)
 
       # HTML anchor on hdlist1 (i.e. command options)
       html.gsub!(/<dt class="hdlist1">(.*?)<\/dt>/) do |_m|
-        dt_content = $1
-        text = dt_content.gsub(/<\/?[^>]+>/, "").tr("^A-Za-z0-9-", "")
+        inner_html = $1
+        text = inner_html.gsub(/<\/?[^>]+>/, "").tr("^A-Za-z0-9-", "")
         # use txt_path for backward compatibility of already-existing
 	# deep links shared across the interwebs.
 	anchor = "#{txt_path}-#{text}"
         # handle anchor collisions by appending -1
         anchor += "-1" while ids.include?(anchor)
         ids.add(anchor)
 
-        "<dt class=\"hdlist1\" id=\"#{anchor}\"> <a class=\"anchor\" href=\"##{anchor}\"></a>#{$1} </dt>"
+        "<dt class=\"hdlist1\" id=\"#{anchor}\"> <a class=\"anchor\" href=\"##{anchor}\"></a>#{inner_html} </dt>"
       end
       # Make links relative
       html.gsub!(/(<a href=['"])\/([^'"]*)/) do |match|
@@ -466,15 +466,15 @@ def index_doc(filter_tags, doc_list, get_content)
         end
         # HTML anchor on hdlist1 (i.e. command options)
         html.gsub!(/<dt class="hdlist1">(.*?)<\/dt>/) do |_m|
-          dt_content = $1
-          text = dt_content.gsub(/<\/?[^>]+>/, "").tr("^A-Za-z0-9-", "")
+          inner_html = $1
+          text = inner_html.gsub(/<[^>]+>/, "").tr("^A-Za-z0-9-", "")
           # use txt_path for backward compatibility of already-existing
           # deep links shared across the interwebs.
           anchor = "#{txt_path}-#{text}"
           # handle anchor collisions by appending -1
           anchor += "-1" while ids.include?(anchor)
           ids.add(anchor)
-          "<dt class=\"hdlist1\" id=\"#{anchor}\"> <a class=\"anchor\" href=\"##{anchor}\"></a>#{$1} </dt>"
+          "<dt class=\"hdlist1\" id=\"#{anchor}\"> <a class=\"anchor\" href=\"##{anchor}\"></a>#{inner_html} </dt>"
         end
         # Make links relative
         html.gsub!(/(<a href=['"])\/([^'"]*)/) do |relurl|