Fix typos found by codespell

Closes #344

Author: DimitriPapadopoulos

stdnum/ch/uid.py

@@ -141,7 +141,7 @@ def check_uid(number, timeout=30):  # pragma: no cover
     client = get_soap_client(uid_wsdl, timeout)
     try:
         return client.GetByUID(uid={'uidOrganisationIdCategorie': number[:3], 'uidOrganisationId': number[3:]})[0]
-    except Exception:  # noqa: B902 (excpetion type depends on SOAP client)
+    except Exception:  # noqa: B902 (exception type depends on SOAP client)
         # Error responses by the server seem to result in exceptions raised
         # by the SOAP client implementation
         return

stdnum/gh/tin.py

@@ -24,7 +24,7 @@
 This number is issued by the Ghana Revenue Authority (GRA) to individuals who
 are not eligible for the Ghanacard PIN and other entities.
 
-This number consists of 11 alpha-numeric characters. It begins with one of the
+This number consists of 11 alphanumeric characters. It begins with one of the
 following prefixes:
 
     P00 For Individuals.