fix(crons): Add missing API docs for project / config

Fixes GH-85534

src/sentry/api/serializers/rest_framework/project.py

@@ -9,10 +9,10 @@
 
 @extend_schema_field(field=OpenApiTypes.STR)
 class ProjectField(serializers.Field):
-    def __init__(self, scope="project:write", id_allowed=False):
+    def __init__(self, scope="project:write", id_allowed=False, **kwags):
         self.scope = scope
         self.id_allowed = id_allowed
-        super().__init__()
+        super().__init__(**kwags)
 
     def to_representation(self, value):
         return value

src/sentry/monitors/validators.py

@@ -244,12 +244,16 @@ def validate(self, attrs):
         return attrs
 
 
-@extend_schema_serializer(exclude_fields=["project", "config", "alert_rule"])
+@extend_schema_serializer(exclude_fields=["alert_rule"])
 class MonitorValidator(CamelSnakeSerializer):
-    project = ProjectField(scope="project:read")
+    project = ProjectField(
+        scope="project:read",
+        required=True,
+        help_text="The project to associate the monitor to.",
+    )
     name = serializers.CharField(
         max_length=128,
-        help_text="Name of the monitor. Used for notifications.",
+        help_text="Name of the monitor. Used for notifications. If not set the slug will be derived from your monitor name.",
     )
     slug = SentrySerializerSlugField(
         max_length=DEFAULT_SLUG_MAX_LENGTH,
@@ -275,7 +279,7 @@ class MonitorValidator(CamelSnakeSerializer):
         required=False,
         default="cron_job",
     )
-    config = ConfigValidator()
+    config = ConfigValidator(help_text="The configuration for the monitor.")
     alert_rule = MonitorAlertRuleValidator(required=False)
 
     def validate_status(self, value):