Fix typo in section method for base ring injection in p-adic two-step…

… extensions

src/sage/rings/padics/relative_extension_leaves.py

@@ -37,7 +37,7 @@ def _call_with_args(self, x, args=(), kwds={}):
         return self.codomain()([x], *args, **kwds)
 
     def section(self):
-        return pAdicRelativeBaseringSection(S, R)
+        return pAdicRelativeBaseringSection(self.codomain(), self.domain())
 
 class pAdicRelativeBaseringSection(Morphism):
     def __init__(self, S, R):