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/__init__.py

@@ -125,7 +125,7 @@ class InferenceState:
         debug.dbg('execute result: %s in %s', value_set, value)
         return value_set
 
-    # mypy doesn't suppport decorated propeties (https://github.com/python/mypy/issues/1362)
+    # mypy doesn't support decorated properties (https://github.com/python/mypy/issues/1362)
     @property
     @inference_state_function_cache()
     def builtins_module(self):