Fix some typos

Author: christianp

server/direct.rst

@@ -137,7 +137,7 @@ Most of the examples also load a number of TeX extensions:
    import '@mathjax/src/js/input/tex/base/BaseConfiguration.js';
    import '@mathjax/src/js/input/tex/ams/AmsConfiguration.js';
    import '@mathjax/src/js/input/tex/newcommand/NewcommandConfiguration.js';
-   import '@mathjax/src/js/input/tex/noundefined/NoundefinedConfiguration.js';
+   import '@mathjax/src/js/input/tex/noundefined/NoUndefinedConfiguration.js';
 
 Here, we load the `base`, :ref:`tex-ams`, :ref:`tex-newcommand`, and
 :ref:`tex-noundefined` extensions.  The names of these packages are

upgrading/whats-new-4.0/accessing.rst

@@ -54,7 +54,7 @@ MathJax Scoped NPM Packages
 
 With version 4, MathJax has moved to scoped packages for the source
 and font npm packages.  The ``mathjax-full`` package is now
-``@mathjax/scr``, and the font packages are
+``@mathjax/src``, and the font packages are
 ``@mathjax/mathjax-stix2-font``, ``@mathjax/mathjax-fira-font``, and
 so on.  Future extensions and other packages will be in the
 ``@mathjax`` scope as well.  The only exception is that the