[LyX/master] typo

[Pavel Sanda]

commit 48c4763b866239087cb80989c5fa42f2a93604f3
Author: Pavel Sanda <sa...@lyx.org>
Date:   Fri Jun 3 11:19:02 2016 -0700

    typo

diff --git a/src/frontends/qt4/ui/FontUi.ui b/src/frontends/qt4/ui/FontUi.ui
index 3c0e14c..416c3fb 100644
--- a/src/frontends/qt4/ui/FontUi.ui
+++ b/src/frontends/qt4/ui/FontUi.ui
@@ -258,7 +258,7 @@
    <item row="10" column="1">
     <widget class="QCheckBox" name="microtypeCB">
      <property name="toolTip">
-      <string>Activate extensions such as character protusion and font 
expansion via the microtype package</string>
+      <string>Activate extensions such as character protrusion and font 
expansion via the microtype package</string>
      </property>
      <property name="text">
       <string>Enable micr&amp;o-typographic extensions</string>