fixed typo

src/compas_timber/connections/t_butt.py

@@ -82,10 +82,10 @@ def cutting_plane(self):
         cfr = Frame(cfr.point, cfr.yaxis, cfr.xaxis)  # flip normal towards the inside of main beam
         return cfr
 
-    def restore_beams_from_keys(self, assemly):
+    def restore_beams_from_keys(self, assembly):  # TODO: fix typo
         """After de-serialization, resotres references to the main and cross beams saved in the assembly."""
-        self.main_beam = assemly.find_by_key(self.main_beam_key)
-        self.cross_beam = assemly.find_by_key(self.cross_beam_key)
+        self.main_beam = assembly.find_by_key(self.main_beam_key)
+        self.cross_beam = assembly.find_by_key(self.cross_beam_key)
 
     def add_features(self):
         """Adds the trimming plane to the main beam (no features for the cross beam).