documentation update

Author: ddmitov

CREDITS.md

@@ -89,6 +89,7 @@ http://doc.qt.io/qt-5/qwebenginepage.html#fullScreenRequested
 http://doc.qt.io/qt-5/qwebenginepage.html#windowCloseRequested  
 http://doc.qt.io/qt-5/qtwebengine-webenginewidgets-simplebrowser-example.html#adding-context-menu-items  
 http://doc.qt.io/qt-5/qwebenginefullscreenrequest.html  
+http://doc.qt.io/qt-5/qprocess.html#terminate  
 
 https://wiki.qt.io/Qt_Coding_Style  
 https://wiki.qt.io/Open_Web_Page_in_QWebView  
@@ -159,7 +160,7 @@ https://perldoc.perl.org/File/Path.html
 https://metacpan.org/pod/File::Copy::Recursive  
 https://metacpan.org/pod/Module::ScanDeps  
 
-https://www.perl.com/pub/2002/05/14/mod_perl.html  
+https://www.perl.com/article/37/2013/8/18/Catch-and-Handle-Signals-in-Perl/
 
 https://www.perlmonks.org/bare/?node_id=768448 "Permanently sort a hash"  
 https://www.perlmonks.org/?node_id=27443 "Checking to see if a particular Module is installed"  

doc/SETTINGS.md

@@ -57,7 +57,7 @@ The ``pebSettings`` JavaScript object may have the following properties:
   ``String`` displayed in a JavaScript Confirm popup box when the close button is pressed, but unsaved data in local HTML forms is detected. If no ``closeConfirmation`` object property is found, PEB exits immediately.
 
 ## Perl Scripts API
-Every Perl script run by PEB has a JavaScript settings object with an arbitrary name and fixed object properties. The name of the JavaScript settings object with a ``.script`` extension forms pseudo filename used to start the Perl script.  
+Every Perl script run by PEB has a JavaScript settings object with an arbitrary name and fixed object properties. The name of the JavaScript settings object with a ``.script`` extension forms settings pseudo filename used to start the Perl script.  
 
 There are three methods to start a local Perl script:  
 
@@ -138,8 +138,7 @@ Please note that interactive Perl scripts are not supported by the Windows build
 
 PEB interactive scripts should have ``$|=1;`` among their first lines to disable the built-in buffering of the Perl interpreter, which prevents any output before the script has ended.  
 
-When PEB is closing, it sends the ``SIGTERM`` signal to all interactive scripts to prevent them from becoming zombie processes. All interactive scripts must exit in 3 seconds after the ``SIGTERM`` signal is given by PEB.  
-All unresponsive scripts are killed before PEB exits. The  ``SIGTERM`` signal may be handled by any interactive script for a graceful shutdown using the following code:
+When PEB is closing, it sends the ``SIGTERM`` signal to all interactive scripts to prevent them from becoming zombie processes. All interactive scripts must exit in 3 seconds after the ``SIGTERM`` signal is given by PEB. All unresponsive scripts are killed before PEB exits. The  ``SIGTERM`` signal may be handled by any interactive script for a graceful shutdown using the following code:
 
 ```perl
 $SIG{TERM} = sub {