Adding more explanations to the license parameter. (#351)

Author: apetenchea

arango/database.py

@@ -436,7 +436,7 @@ def set_license(self, license: str, force: bool = False) -> Result[Json]:
         instance. Can be called on single servers, Coordinators,
         and DB-Servers.
 
-        :param license: The Base64-encoded license string.
+        :param license: The Base64-encoded license string, wrapped in double-quotes.
         :type license: str
         :param force: If set to True, the new license will be set even if
             it expires sooner than the current license.

tests/test_database.py

@@ -454,7 +454,7 @@ def test_license(sys_db, enterprise):
     else:
         assert license == {"license": "none"}
         with pytest.raises(ServerLicenseSetError):
-            sys_db.set_license("abc")
+            sys_db.set_license('"abc"')
 
 
 def test_options(sys_db, db_version):