Doc: Rename some images from "targets" to "kits"

Change-Id: Ibb5475e15c7f2fa845e8060cf176296693769766
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/src/projects/creator-projects-opening.qdoc

@@ -43,7 +43,7 @@
     configured in \gui Tools > \gui Options > \gui {Build & Run} > \gui Kits.
     Select the kits that you want to build and run the project with.
 
-    \image qtcreator-open-project-targets.png "Configure Project tab"
+    \image qtcreator-open-project-kits.png "Configure Project tab"
 
     Even if you do not intend to build the project, the C++ and QML code models
     need a Qt version and compiler to offer code completion. To specify them,

doc/src/projects/creator-projects-settings-overview.qdoc

@@ -43,7 +43,7 @@
 
     \section1 Selecting Kits
 
-    \image qtcreator-project-targets.png
+    \image qtcreator-project-kits.png
 
     To add kits for the project, select \gui {Add Kit}. The list displays kits
     that are configured in \gui Tools > \gui Options > \gui {Build & Run} >

doc/src/projects/creator-projects-targets.qdoc

@@ -65,7 +65,7 @@
         \li Select \gui Tools > \gui Options > \gui {Build & Run} > \gui Kits
             > \gui Add.
 
-            \image qtcreator-targets.png
+            \image qtcreator-kits.png
 
             To clone the selected kit, select \gui Clone.