Doc: Enable zero qdoc warnings limit

Change-Id: I2f2828bfc2d267fffac3eb2b9a9ec7e575d347a0
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

coin/module_config.yaml

@@ -10,3 +10,4 @@ instructions:
 
   Test:
     - !include "{{qt/qtbase}}/coin_module_test_template_v3.yaml"
+    - !include "{{qt/qtbase}}/coin_module_test_docs.yaml"

src/scxml/doc/qtscxml.qdocconf

@@ -52,3 +52,6 @@ manifestmeta.highlighted.names = "QtScxml/Qt SCXML Traffic Light QML Example (Dy
 navigation.landingpage = "Qt SCXML"
 navigation.cppclassespage = "Qt SCXML C++ Classes"
 navigation.qmltypespage = "Qt SCXML QML Types"
+
+# Fail the documentation build if there are more warnings than the limit
+warninglimit = 0

src/statemachine/doc/qtstatemachine.qdocconf

@@ -50,3 +50,6 @@ tagfile = qtstatemachine.tags
 navigation.landingpage = "Qt State Machine"
 navigation.cppclassespage = "Qt State Machine C++ Classes"
 navigation.qmltypespage = "Qt State Machine QML Types"
+
+# Fail the documentation build if there are more warnings than the limit
+warninglimit = 0