Added missing api docs

python/core/layertree/qgslayertreeregistrybridge.sip

@@ -17,6 +17,7 @@ class QgsLayerTreeRegistryBridge : QObject
 %End
 
   public:
+    //! Create the instance that synchronizes given project with a layer tree root
     explicit QgsLayerTreeRegistryBridge( QgsLayerTreeGroup* root, QgsProject* project, QObject *parent /TransferThis/ = 0 );
 
     void setEnabled( bool enabled );

python/core/qgsmapthemecollection.sip

@@ -61,6 +61,9 @@ class QgsMapThemeCollection : QObject
 
     };
 
+    /**
+     * Create map theme collection that handles themes of the given project.
+     */
     QgsMapThemeCollection( QgsProject* project );
 
     /**

src/core/layertree/qgslayertreeregistrybridge.h

@@ -41,6 +41,7 @@ class CORE_EXPORT QgsLayerTreeRegistryBridge : public QObject
 {
     Q_OBJECT
   public:
+    //! Create the instance that synchronizes given project with a layer tree root
     explicit QgsLayerTreeRegistryBridge( QgsLayerTreeGroup* root, QgsProject* project, QObject *parent = nullptr );
 
     void setEnabled( bool enabled ) { mEnabled = enabled; }

src/core/qgsmapthemecollection.h

@@ -113,6 +113,9 @@ class CORE_EXPORT QgsMapThemeCollection : public QObject
         friend class QgsMapThemeCollection;
     };
 
+    /**
+     * Create map theme collection that handles themes of the given project.
+     */
     QgsMapThemeCollection( QgsProject* project );
 
     /**