Added check if the Windows version is not supporting the ConPty or WinPty disable the PSQL for that version.

refs #2341

docs/en_US/psql_tool.rst

@@ -10,6 +10,10 @@ PSQL tool allows user to connect to PostgreSQL/EDB Advanced server using psql te
 
 * PSQL will connect to the current connected database from browser tree.
 
+* PSQL utility does support execution of OS meta-commands by using "\\!". Due
+  to security concerns, we have disabled the execution of such commands in
+  pgAdmin. To enable OS meta-commands set ALLOW_PSQL_SHELL_COMMANDS = True in configuration.
+
 .. image:: images/psql_tool.png
     :alt: PSQL tool window
     :align: center
@@ -17,3 +21,5 @@ PSQL tool allows user to connect to PostgreSQL/EDB Advanced server using psql te
 You can open multiple instance of the PSQL tool in individual tabs simultaneously.
 To close the PSQL tool, click the *X* in the upper-right hand corner of the tab bar.
 
+**Note:** For the Windows platform, this feature is available on Windows 10 (1809 version) and onwards.
+