fix error message, descriptions

Author: prha

python_modules/dagster/dagster/_core/definitions/op_definition.py

@@ -91,8 +91,7 @@ class OpDefinition(NodeDefinition, IHasInternalInit):
         code_version (Optional[str]): (Experimental) Version of the code encapsulated by the op. If set,
             this is used as a default code version for all outputs.
         retry_policy (Optional[RetryPolicy]): The retry policy for this op.
-        pool (Optional[str]): A string that identifies the concurrency limit group that governs
-            this op's execution.
+        pool (Optional[str]): A string that identifies the pool that governs this op's execution.
 
 
     Examples:
@@ -613,7 +612,7 @@ def _validate_pool(pool, tags):
     tag_concurrency_key = tags.get(GLOBAL_CONCURRENCY_TAG)
     if pool and tag_concurrency_key and pool != tag_concurrency_key:
         raise DagsterInvalidDefinitionError(
-            f'Concurrency group "{pool}" that conflicts with the concurrency key tag "{tag_concurrency_key}".'
+            f'Pool "{pool}" conflicts with the concurrency key tag "{tag_concurrency_key}".'
         )
 
     if pool:

python_modules/dagster/dagster/_core/snap/execution_plan_snapshot.py

@@ -177,7 +177,7 @@ def __new__(
             ),
             tags=check.opt_nullable_mapping_param(tags, "tags", key_type=str, value_type=str),
             step_handle=check.opt_inst_param(step_handle, "step_handle", StepHandleTypes),
-            # stores the concurrency group arg as separate from the concurrency_key property since the
+            # stores the pool arg as separate from the concurrency_key property since the
             # snapshot may have been generated before concurrency_key was added as a separate
             # argument
             pool=check.opt_str_param(pool, "pool"),