Documentation: Docbook: Fix generated DocBook/kernel-api.xml

This patch fix spelling typo found in DocBook/kernel-api.xml.
It is because the file is generated from the source comments,
I have to fix the comments in source codes.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/ipc/util.c b/ipc/util.c
index 27d74e6..d73b7af5 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -309,7 +309,7 @@
 /**
  * ipcget_new -	create a new ipc object
  * @ns: ipc namespace
- * @ids: ipc identifer set
+ * @ids: ipc identifier set
  * @ops: the actual creation routine to call
  * @params: its parameters
  *
@@ -363,7 +363,7 @@
 /**
  * ipcget_public - get an ipc object or create a new one
  * @ns: ipc namespace
- * @ids: ipc identifer set
+ * @ids: ipc identifier set
  * @ops: the actual creation routine to call
  * @params: its parameters
  *
@@ -669,7 +669,7 @@
 
 /**
  * ipcget - Common sys_*get() code
- * @ns: namsepace
+ * @ns: namespace
  * @ids: ipc identifier set
  * @ops: operations to be called on ipc object creation, permission checks
  *       and further checks