[PATCH app/xrandr] Document format of --dpi option in non-ambiguous way

[Pali Rohár]

Slash in previous documentation could be misunderstood as part of the
--dpi command line option. So fix it.

Signed-off-by: Pali Rohár <pali.rohar at gmail.com>
---
 man/xrandr.man |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/man/xrandr.man b/man/xrandr.man
index 5742286..55ea5dd 100644
--- a/man/xrandr.man
+++ b/man/xrandr.man
@@ -41,7 +41,8 @@ xrandr \- primitive command line interface to RandR extension
 [\-\-prop]
 [\-\-fb \fIwidth\fPx\fIheight\fP]
 [\-\-fbmm \fIwidth\fPx\fIheight\fP]
-[\-\-dpi \fIdpi\fP/\fIoutput\fP]
+[\-\-dpi \fIdpi\fP]
+[\-\-dpi \fIfrom-output\fP]
 [\-\-newmode \fIname\fP \fImode\fP]
 [\-\-rmmode \fIname\fP]
 [\-\-addmode \fIoutput\fP \fIname\fP]
@@ -228,7 +229,8 @@ option provides a way to override that behaviour.
 Sets the reported values for the physical size of the screen. Normally,
 xrandr resets the reported physical size values to keep the DPI constant.
 This overrides that computation.
-.IP "\-\-dpi \fIdpi\fP/\fIoutput\fP"
+.IP "\-\-dpi \fIdpi\fP"
+.IP "\-\-dpi \fIfrom-output\fP"
 This also sets the reported physical size values of the screen, it uses either
 the specified DPI value, or the DPI of the given output, to compute an appropriate
 physical size using whatever pixel size will be set.
-- 
1.7.9.5