Small manpage problems

[Sven Joachim]

Debian's great lintian tool noticed two spelling errors and a missing
macro definition in the manpages, as of the 20170513 patchlevel.  See
the attached patch.

Cheers,
       Sven

diff --git a/doc/html/man/curs_add_wch.3x.html 
b/doc/html/man/curs_add_wch.3x.html
index b0d8b614..c7ace32e 100644
--- a/doc/html/man/curs_add_wch.3x.html
+++ b/doc/html/man/curs_add_wch.3x.html
@@ -237,7 +237,7 @@
            intended.  But there are several possibilities, all with problems.
 
            Unicode  6.0  (2010)  does provide two lantern symbols: U+1F383 and
-           U+1F3EE.  Those were not availble in 2002, and are irrelevant since
+           U+1F3EE.  Those were not available in 2002, and are irrelevant since
            they  lie  outside the BMP and as a result are not generally avail-
            able in terminals.  They are not storm lanterns, in any case.
 
diff --git a/man/curs_mouse.3x b/man/curs_mouse.3x
index 8b433ec5..7b525abf 100644
--- a/man/curs_mouse.3x
+++ b/man/curs_mouse.3x
@@ -28,6 +28,10 @@
 .\"***************************************************************************
 .\"
 .\" $Id: curs_mouse.3x,v 1.45 2017/05/06 17:29:26 tom Exp $
+.ie \n(.g .ds `` \(lq
+.el       .ds `` ``
+.ie \n(.g .ds '' \(rq
+.el       .ds '' ''
 .de NS
 .ie \n(.sp
 .el    .sp .5
@@ -289,7 +293,7 @@ the \*(``terminfo\*('' manual page lists capabilities for 
the feature
 .NS
 buttons           btns    BT       Number of buttons on the mouse
 get_mouse         getm    Gm       Curses should get button events
-key_mouse         kmous   Km       0631, Mouse event has occured
+key_mouse         kmous   Km       0631, Mouse event has occurred
 mouse_info        minfo   Mi       Mouse status information
 req_mouse_pos     reqmp   RQ       Request mouse position report
 .NE