btrfs-progs: docs: auto-repair editing

Author: (@silopolis)

Documentation/Auto-repair.rst

@@ -1,14 +1,16 @@
 Auto-repair on read
 ===================
 
-Data or metadata that are found to be damaged (e.g. because the checksum does
-not match) at the time they're read from a device can be salvaged in case the
-filesystem has another valid copy when using block group profile with redundancy
-(DUP, RAID1-like, RAID5/6). The correct data are returned to the user application
-and the damaged copy is replaced by it. When this happen a message is emitted
-to the system log.
-
-If there are more copies of data and one of them is damaged but not read by
-user application then this is not detected. To verify all data and metadata
-copies there's :doc:`scrub<Scrub>` that needs to be started manually, automatic
-repairs happens in that case.
+If data or metadata that are found to be damaged at the time they’re read from a device,
+for example because the checksum does not match, they can be salvaged if the filesystem
+has another valid copy. This can be achieved by using a block group profile with redundancy
+like DUP, RAID1-like, or RAID5/6.
+
+The correct data is returned to the user application and the damaged copy is replaced by it.
+When this happens, a message is emitted to the system log.
+
+If there are multiple copies of data and one of them is damaged but not read by the user
+application, then this is not detected.
+
+To ensure the verification and automatic repair of all data and metadata copies, the
+:doc:`scrub<Scrub>` operation must be initiated manually.