doc: clarify WAL in bluestore-config-ref.rst

Other people might not know this abbreviation too when diving into storage topics for the first time

Signed-off-by: CodingSpiderFox <codingspiderfox@gmail.com>

diff --git a/doc/rados/configuration/bluestore-config-ref.rst b/doc/rados/configuration/bluestore-config-ref.rst
index d8e79d34347b38bbfc385e63b47e13a9e5e1fdeb..29139f6dd4a75d470353d3cad46f86fcaa9ccf71 100644 (file)
--- a/doc/rados/configuration/bluestore-config-ref.rst
+++ b/doc/rados/configuration/bluestore-config-ref.rst
@@ -23,7 +23,7 @@ device.  The storage device is normally partitioned into two parts:
 
 It is also possible to deploy BlueStore across two additional devices:
 
-* A *WAL device* can be used for BlueStore's internal journal or
+* A *write-ahead log (WAL) device* can be used for BlueStore's internal journal or
   write-ahead log.  It is identified by the ``block.wal`` symlink in
   the data directory.  It is only useful to use a WAL device if the
   device is faster than the primary device (e.g., when it is on an SSD