patch 8.0.1330: MS-Windows: job in terminal can't get back to Vim

Problem:    MS-Windows: job in terminal can't get back to Vim.
Solution:   set VIM_SERVERNAME in the environment. (Yasuhiro Matsumoto, closes
            #2360)
diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index b3df8ce..2a1972c 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -1,4 +1,4 @@
-*terminal.txt*	For Vim version 8.0.  Last change: 2017 Nov 12
+*terminal.txt*	For Vim version 8.0.  Last change: 2017 Nov 17
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -106,6 +106,10 @@
 options specifically for the window and buffer.  Example: >
    au BufWinEnter * if &buftype == 'terminal' | setlocal bufhidden=hide | endif
 
+Mouse events (click and drag) are passed to the terminal.  Mouse move events
+are only passed when Vim itself is receiving them.  For a terminal that is
+when 'balloonevalterm' is enabled.
+
 
 Size and color ~
 							*terminal-size-color*
@@ -335,6 +339,9 @@
 version, rename to winpty32.dll and winpty64.dll to match the way Vim was
 build.
 
+Environment variables are used to pass information to the running job:
+    VIM_SERVERNAME	v:servername
+
 ==============================================================================
 2. Remote testing					*terminal-testing*