Updated matlab-Root help content.

Author: nbhoski

src/main/resources/com/mathworks/ci/UseMatlabVersionBuildWrapper/help-matlabRootFolder.html

@@ -1,6 +1,6 @@
 <div>
-  Enter the full path to the MATLAB root folder, which is returned by the <i><b>matlabroot</b></i> function. The specified MATLAB will be added to PATH variable and will be used across this build.
-  If this field is empty then default matlabroot from PATH variable will be picked if added. <br><br><br>Example:<br><br><i><b><u>Windows:</u></b></i><br> C:\Program Files\MATLAB\R2019a <br>
+  Enter the full path to the MATLAB root folder, which is returned by the <i><b>matlabroot</b></i> function. The specified directory will be added to the front of the PATH environment variable, and the specified MATLAB version will be used to perform the build.
+  You must not leave this field blank if no MATLAB directory exists on the path. If you leave the field blank, then the system tries to use the MATLAB directory closest to the top of the system path. <br><br><br>Example:<br><br><i><b><u>Windows:</u></b></i><br> C:\Program Files\MATLAB\R2019a <br>
   <i><b><u>Linux:</u></b></i><br> /usr/local/MATLAB/R2019a <br>
   <i><b><u>Mac:</u></b></i><br> /Applications/MATLAB_R2019a.app <br>
   <p>