Add missing doc

python/core/qgsfeatureiterator.sip

@@ -72,9 +72,7 @@ end of iterating: free the resources / lock
 
  If you want to check if the iterator successfully completed, better use QgsFeatureIterator.isClosed().
 
-.. note::
-
-   Added in QGIS 3.0
+.. versionadded:: 3.0
  :rtype: bool
 %End
 
@@ -257,9 +255,7 @@ destructor deletes the iterator if it has no more references
 
 .. seealso:: isClosed to check if the iterator successfully completed and returned all the features.
 
-.. note::
-
-   Added in QGIS 3.0
+.. versionadded:: 3.0
  :rtype: bool
 %End
 

src/core/qgsconnectionpool.h

@@ -85,6 +85,13 @@ class QgsConnectionPoolGroup
     //! QgsConnectionPoolGroup cannot be copied
     QgsConnectionPoolGroup &operator=( const QgsConnectionPoolGroup &other ) = delete;
 
+    /**
+     * Try to acquire a connection for a maximum of \a timeout milliseconds.
+     * If \a timeout is a negative value the calling thread will be blocked
+     * until a connection becomes available. This is the default behavior.
+     *
+     * \returns initialized connection or nullptr if unsuccessful
+     */
     T acquire( int timeout )
     {
       // we are going to acquire a resource - if no resource is available, we will block here

src/core/qgsfeatureiterator.h

@@ -90,7 +90,7 @@ class CORE_EXPORT QgsAbstractFeatureIterator
      *
      * If you want to check if the iterator successfully completed, better use QgsFeatureIterator::isClosed().
      *
-     * @note Added in QGIS 3.0
+     * \since QGIS 3.0
      */
     virtual bool isValid() const
     {
@@ -311,7 +311,7 @@ class CORE_EXPORT QgsFeatureIterator
      *
      * \see isClosed to check if the iterator successfully completed and returned all the features.
      *
-     * @note Added in QGIS 3.0
+     * \since QGIS 3.0
      */
     virtual bool isValid() const;