[docu] fix endcode position

Fixes #20679

Author: ferdymercury

bindings/pyroot/pythonizations/python/ROOT/_pythonization/_tcanvas.py

@@ -16,7 +16,6 @@
 will be suspended until <space> key pressed by user. Simple example:
 
 \code{.py}
-\endcode
 import ROOT
 
 c = ROOT.TCanvas()
@@ -29,6 +28,7 @@
 
 # continues after <space> is pressed
 c.SaveAs("canvas.root")
+\endcode
 \endpythondoc
 '''