Doc: removed link to KDE style guide because it had moved

Added the guidelines.

Change-Id: I121ef920475a24c653ecc87292cee5472a0a8a5f
Reviewed-on: http://codereview.qt.nokia.com/1047
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

doc/api/qtcreator-ui-text.qdoc

@@ -154,10 +154,6 @@
 
     \section1 UI Text Capitalization
 
-    The capitalization of the Qt Creator UI text follows the
-    \l{http://developer.kde.org/documentation/standards/kde/style/basics/labels.html#items}
-    {KDE Style Guide}.
-
     Two styles are used, book title and sentence style:
 
     \list
@@ -168,6 +164,11 @@
 
     \endlist
 
+    When using book style capitalization, capitalize all words, except
+    prepositions that are shorter than five letters (for example, 'with' but
+    'Without'), conjunctions (for example, and, or, but), and articles (a, an,
+    the).
+
     Use book style capitalization for:
 
     \list
@@ -182,6 +183,9 @@
 
     \endlist
 
+    When using sentence style capitalization, capitalize only the first letter,
+    except proper names.
+
     Use sentence style capitalization for:
 
     \list