Merge pull request sorintlab#749 from johannesboon/documentSyncTimeout

Document syncTimeout.

Author: sgotti

doc/cluster_spec.md

@@ -39,6 +39,7 @@ Some options in a running cluster specification can be changed to update the des
 | pgHBA                     | a list containing additional pg_hba.conf entries. They will be added to the pg_hba.conf generated by stolon. **NOTE**: these lines aren't validated so if some of them are wrong postgres will refuse to start or, on reload, will log a warning and ignore the updated pg_hba.conf file                                                                                                                                                                                          | no                        | []string          | null. Will use the default behiavior of accepting connections from all hosts for all dbs and users with md5 password authentication                                                   |
 | automaticPgRestart        | restart postgres automatically after changing the pgParameters that requires restart. Refer `pending_restart` in [pg_settings](https://www.postgresql.org/docs/9.5/static/view-pg-settings.html)    | no | bool | false |
 | dbWaitReadyTimeout        | Time to wait for the database to become ready after starting.  Increase this value if your Postgres takes longer to boot, e.g. because it has to recover a lot of WAL. | no | string (duration) | 60s |
+| syncTimeout               | Time to wait for a database recovery (including the replay of WAL files in case of Point-In-Time-Recovery)                                                                                                                                                                                                                                                                                                                                                                        | no                        | string (duration) | 0 (no timeout, waits until recovery has finished)                                                                                   |
 
 #### ExistingConfig