Environment variabelen in changelog

The environment variables in the changelog were replaced by their values and this was not the intention in the changelog
By using the HTML Entity here for the dollar sign this can be prevented.

Author: albert-github

doc/changelog.doc

@@ -3774,7 +3774,7 @@ make sure you add the following:
 <li>   id <a href="https://github.com/doxygen/doxygen/issues/4508">4508</a>: Added support for &lt;inheritdoc/&gt; C# XML command
        (thanks to John Werner for the patch).</li>
 <li>   id <a href="https://github.com/doxygen/doxygen/issues/4588">4588</a>, Added support for resolving environment variables of the
-       form $(PROGRAMFILES(X86)) inside the config file</li>
+       form &#36;(PROGRAMFILES(X86)) inside the config file</li>
 <li>   Doxygen now shows Objective-C properties in collaboration diagrams
        (thanks to Sven Weidauer for the patch).</li>
 <li>   Added ability to search for group or page titles.</li>
@@ -5849,7 +5849,7 @@ make sure you add the following:
 <li>   id 457857: Leading "struct" keyword is no longer stripped from the documentation of
                   functions that return a pointer to a struct.</li>
 <li>   id 458710: Expanding environment variables in the config file to a
-                  file or path name with spaces (e.g. "$(VCInstallDir)include") was
+                  file or path name with spaces (e.g. "&#36;(VCInstallDir)include") was
                   incorrectly interpreted as a list when used with for instance <code>INPUT</code>.</li>
 <li>   id 458749: Undocumented constructors/destructors inside an undocumented member group
                   were not visible in the output.</li>
@@ -7264,7 +7264,7 @@ make sure you add the following:
        now be improved significantly.</li>
 <li>   Made some cosmetic changes to the HTML output (thanks to Ben Harper).</li>
 <li>   STRIP_FROM_PATH now by default strips the path from which doxygen is
-       run (i.e. $(PWD)/ on Unix)</li>
+       run (i.e. &#36;(PWD)/ on Unix)</li>
 </ul>
 <h3>New features</h3>
 <ul>
@@ -7315,7 +7315,7 @@ make sure you add the following:
        Eoin MacDonell for the fix).</li>
 <li>   Grouped pages in the XML output did have the same id as their group.</li>
 <li>   Fixed problem handling environment variables inside a
-       quoted string in the config file (e.g. "$(HOME)/My Path/").</li>
+       quoted string in the config file (e.g. "&#36;(HOME)/My Path/").</li>
 <li>   Using "\mainpage notitle" caused the "notitle" to appear in the treeview.</li>
 <li>   Page references where wrong in the latex output when PDF_HYPERLINKS
        was disabled.</li>
@@ -9166,7 +9166,7 @@ make sure you add the following:
        (thanks to Marvin Wolfthal).</li>
 <li>   In some situations doxygen wanted to write a files containing a \n.</li>
 <li>   Environment variables can now also be used for non-string values
-       in the config file, like for example QUIET = $(QUIET_ON)</li>
+       in the config file, like for example QUIET = &#36;(QUIET_ON)</li>
 <li>   Fixed a number of typo's in the docs (thanks to Philippe Lhoste &amp;
        Jens Seidel).</li>
 <li>   Inheritance through typedefs within a namespace did not yield the