docs: correct BackupSchedule recurrence docs that mentioned specific time of day (#898)

* docs: correct BackupSchedule recurrence docs that mentioned specific time of day
chore: fix typo in DeleteBackupScheduleRequest

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packages/google-cloud-firestore/google/cloud/firestore_admin_v1/services/firestore_admin/async_client.py

@@ -3001,7 +3001,7 @@ async def sample_delete_backup_schedule():
                 The request object. The request for
                 [FirestoreAdmin.DeleteBackupSchedules][].
             name (:class:`str`):
-                Required. The name of backup schedule.
+                Required. The name of the backup schedule.
 
                 Format
                 ``projects/{project}/databases/{database}/backupSchedules/{backup_schedule}``

packages/google-cloud-firestore/google/cloud/firestore_admin_v1/services/firestore_admin/client.py

@@ -3470,7 +3470,7 @@ def sample_delete_backup_schedule():
                 The request object. The request for
                 [FirestoreAdmin.DeleteBackupSchedules][].
             name (str):
-                Required. The name of backup schedule.
+                Required. The name of the backup schedule.
 
                 Format
                 ``projects/{project}/databases/{database}/backupSchedules/{backup_schedule}``

packages/google-cloud-firestore/google/cloud/firestore_admin_v1/types/firestore_admin.py

@@ -329,7 +329,7 @@ class DeleteBackupScheduleRequest(proto.Message):
 
     Attributes:
         name (str):
-            Required. The name of backup schedule.
+            Required. The name of the backup schedule.
 
             Format
             ``projects/{project}/databases/{database}/backupSchedules/{backup_schedule}``

packages/google-cloud-firestore/google/cloud/firestore_admin_v1/types/schedule.py

@@ -72,13 +72,12 @@ class BackupSchedule(proto.Message):
             to its creation time, the backup should be
             deleted, e.g. keep backups for 7 days.
         daily_recurrence (google.cloud.firestore_admin_v1.types.DailyRecurrence):
-            For a schedule that runs daily at a specified
-            time.
+            For a schedule that runs daily.
 
             This field is a member of `oneof`_ ``recurrence``.
         weekly_recurrence (google.cloud.firestore_admin_v1.types.WeeklyRecurrence):
             For a schedule that runs weekly on a specific
-            day and time.
+            day.
 
             This field is a member of `oneof`_ ``recurrence``.
     """
@@ -117,7 +116,7 @@ class BackupSchedule(proto.Message):
 
 
 class DailyRecurrence(proto.Message):
-    r"""Represent a recurring schedule that runs at a specific time
+    r"""Represents a recurring schedule that runs at a specific time
     every day.
     The time zone is UTC.