doc/cephfs/client-auth.rst: correct `This so because` to `This is because`

diff --git a/doc/cephfs/client-auth.rst b/doc/cephfs/client-auth.rst
index 946211bf682e7782f5e3a33ef9918a692f2caa9e..75528f91eaeb63abf22576108289a932c5dc7c8a 100644 (file)
--- a/doc/cephfs/client-auth.rst
+++ b/doc/cephfs/client-auth.rst
@@ -314,7 +314,7 @@ Changing rw permissions in caps
 -------------------------------
 
 It's not possible to modify caps by running ``fs authorize`` except for the
-case when read/write permissions have to be changed. This so because the
+case when read/write permissions have to be changed. This is because the
 ``fs authorize`` becomes ambiguous. For example, user runs ``fs authorize
 cephfs1 client.x /dir1 rw`` to create a client and then runs ``fs authorize
 cephfs1 client.x /dir2 rw`` (notice ``/dir1`` is changed to ``/dir2``).