Fix an attribute call, remove use of mjxRoot, and update a section title

Author: dpvc

advanced/synchronize/filters.rst

@@ -271,7 +271,7 @@ use of the :attr:`mathvariant` attribute on the internal MathML token
 elements to their Unicode equivalents in the Mathematical
 Alphanumerics block.  Because MathML-Core (the version of MathML
 implemented in most browsers) does not include support for
-:attr:`mathvariant` (except as :attr:`mathvariant="normal" on
+:attr:`mathvariant` (except as :attr:`mathvariant="normal"` on
 single-character ``mi`` elements to prevent the automatic
 italicization of the character), this may be useful for cases where
 you want to produce MathML expressions for use with a browser's native

server/components.rst

@@ -221,11 +221,9 @@ different locale or Braille version, as illustrated below.
 
 .. code-block:: javascript
 
-   import {mjxRoot} from '@mathjax/src/js/components/mjs/root.js';
-
    global.MathJax = {
      loader: {
-       paths: {mathjax: mjxRoot()},
+       paths: {mathjax: '@mathjax/src/bundle'},
        load: ['adaptors/liteDOM'],
        require: (file) => import(file)
      },

server/preload.rst

@@ -449,8 +449,8 @@ the loading is complete.
 
 .. _preload-import-cjs:
 
-Loading All Font Data using Import
-==================================
+Loading All Font Data Synchronously
+===================================
 
 In the previous example, we took advantage of ``require()`` to make
 the :js:meth:`loadDynamicFilesSync()` method available to load all the