Fix typos in comments and docstrings (#2101)

Found by codespell:
- curent -> current (classes.py)
- suppport -> support, propeties -> properties (inference/__init__.py)
- existance -> existence (inference/analysis.py)
- Propably -> Probably (inference/value/instance.py)

Co-authored-by: maxtaran2010 <ocotifuzo727@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

jedi/inference/value/instance.py

@@ -224,7 +224,7 @@ class _BaseTreeInstance(AbstractInstanceValue):
             elif isinstance(f, CompiledValueFilter):
                 yield CompiledInstanceClassFilter(self, f)
             else:
-                # Propably from the metaclass.
+                # Probably from the metaclass.
                 yield f
 
     @inference_state_method_cache()