Change tooltips as suggested by Leena.

Reviewed-by: Leena Miettinen

src/plugins/help/docsettingspage.ui

@@ -11,9 +11,7 @@
    </rect>
   </property>
   <property name="toolTip">
-   <string>&lt;html&gt;&lt;body&gt;&lt;p&gt;The Documentation page lets you install and remove compressed help files.&lt;/p&gt;
-&lt;p&gt;Click the &lt;b&gt;Install&lt;/b&gt; button and choose the path of the compressed help file (*.qch) you would like to install. To delete a help file, select a documentation set in the list and click &lt;b&gt;Remove&lt;/b&gt;.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;
-</string>
+   <string>Add and remove compressed help files, .qch.</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>

src/plugins/help/filtersettingspage.ui

@@ -13,15 +13,7 @@
   <property name="toolTip">
    <string>&lt;html&gt;&lt;body&gt;
 &lt;p&gt;
-The Filters page lets you create and remove documentation filters.
-&lt;/p&gt;&lt;p&gt;
-To add a new filter, click the &lt;b&gt;Add&lt;/b&gt; button, specify a filter name in the pop-up dialog and click &lt;b&gt;OK&lt;/b&gt;, then select the filter attributes in the list box on the right hand side. You can delete a filter by selecting it and clicking the &lt;b&gt;Remove&lt;/b&gt; button.
-&lt;/p&gt;&lt;p&gt;
-A filter is identified by its name and contains a list of filter attributes. An attribute is just a string that can be freely chosen. Attributes are defined by the documentation itself, this means that every documentation set usually has one or more attributes.
-&lt;/p&gt;&lt;p&gt;
-For example, the Qt 4.7.0 Linguist documentation defines the attributes '&lt;b&gt;qt&lt;/b&gt;', '&lt;b&gt;tools&lt;/b&gt;' and '&lt;b&gt;4.7.0&lt;/b&gt;', Qt Designer defines '&lt;b&gt;designer&lt;/b&gt;', '&lt;b&gt;tools&lt;/b&gt;' and '&lt;b&gt;4.7.0&lt;/b&gt;'. The filter to display all tools would then define only the attribute '&lt;b&gt;tools&lt;/b&gt;' since this attribute is part of both documentation sets. 
-&lt;/p&gt;&lt;p&gt;
-Adding the attribute '&lt;b&gt;qmake&lt;/b&gt;' to the filter would then only show qmake documentation, since the Qt Designer documentation does not contain this attribute. Having an empty list of attributes in a filter will match all documentation; i.e., it is equivalent to requesting unfiltered documentation.
+Add, modify, and remove document filters, which determine the documentation set displayed in the Help mode.  The attributes are defined in the documents. Select them to display a set of relevant documentation. Note that some attributes are defined in several documents.
 &lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">