doc: Fixed some of the typos within the README.MD for the PIT example(#1902)

Author: nsmith78660

examples/mongodbatlas_cloud_provider_snapshot_restore_job/point-in-time/README.md

@@ -7,9 +7,9 @@ Variables Required:
 - `cluster_name`: Name of the cluster
 - `point_in_time_utc_seconds`: Point in time to restore to, a number of seconds since unix epoch.
 
-In order to utilize the backup restore job via point in time, fist you need a backup with which to restore.
+In order to utilize the backup restore job via point in time, first you need a backup with which to restore.
 This example has been configured to only create the backup restore if `point_in_time_utc_seconds` is a non-zero number.
-As such, utilize the following example `terraform.tfvars` and pseudo-code to execute a workign example:
+As such, utilize the following example `terraform.tfvars` and pseudo-code to execute a working example:
 
 Example `terraform.tfvars`
 ```