doc/glossary: Add "S3"

Add "S3" entry to the glossary.

Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit be6d0645c40431e8312244019c0331e4076bd5f2)

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 3e190ea9e56e801606737a88b90400d2caac83b8..5ea223fa5ff0a9a7353fcb2dc5b9920bdee62265 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -463,6 +463,14 @@
                 Amazon S3 RESTful API and the OpenStack Swift API. Also called
                 "RADOS Gateway" and "Ceph Object Gateway".
 
+        S3
+                In the context of Ceph, S3 is one of the two APIs supported by
+                the Ceph Object Store. The other API supported by the Ceph
+                Object Store is OpenStack Swift.
+
+                See `the Amazon S3 overview page
+                <https://aws.amazon.com/s3/>`_.
+
         scrubs
 
                 The processes by which Ceph ensures data integrity. During the