Fix spelling check and sip binding

Author: pblottiere

python/core/geometry/qgstriangle.sip.in

@@ -379,7 +379,7 @@ Example:
     QgsPoint inscribedCenter() const;
 %Docstring
 Center of the inscribed circle of the triangle. Z dimension is
-supported and is retrieved from the first 3D point amongst vertexes.
+supported and is retrieved from the first 3D point amongst vertices.
 
 :return: The center of the inscribed circle of the triangle.
 An empty point is returned for empty triangle.

python/gui/qgsmaptoolcapture.sip.in

@@ -104,15 +104,15 @@ convenient method to clean members
 
     QgsPoint fromPointXY( const QgsPointXY &point ) const;
 %Docstring
- Creates a QgsPoint with ZM support if necessary (according to the
- WkbType of the current layer) from a QgsPointXY.
+Creates a QgsPoint with ZM support if necessary (according to the
+WkbType of the current layer) from a :py:class:`QgsPointXY`.
 
- \param point A QgsPointXY to convert
+:param point: A QgsPointXY to convert
+
+:return: a point if ZM support if necessary
 
- :return: a point if ZM support if necessary
 
 .. versionadded:: 3.0
- :rtype: QgsPoint
 %End
 
     int addVertex( const QgsPointXY &point );

src/core/geometry/qgstriangle.h

@@ -352,7 +352,7 @@ class CORE_EXPORT QgsTriangle : public QgsPolygon
 
     /**
      * Center of the inscribed circle of the triangle. Z dimension is
-     * supported and is retrieved from the first 3D point amongst vertexes.
+     * supported and is retrieved from the first 3D point amongst vertices.
      * \returns The center of the inscribed circle of the triangle.
      * An empty point is returned for empty triangle.
      * * Example: