Merge pull request #115322 from dotlambda/doc-lt

doc: replace &lt; with < in Markdown

doc/builders/packages/emacs.section.md

···
       ;; load some packages
 
       (use-package company
-        :bind ("<C-tab>" . company-complete)
+        :bind ("<C-tab>" . company-complete)
         :diminish company-mode
         :commands (company-mode global-company-mode)
         :defer 1

doc/languages-frameworks/qt.section.md

···
 
 stdenv.mkDerivation {
   # ...
-  # Disable this library with Qt < 5.9.0
+  # Disable this library with Qt < 5.9.0
   meta.broken = lib.versionOlder qtbase.version "5.9.0";
 }
 ```