Doc: treewide : Fix typos in DocBook/filesystem.xml

This patch fix spelling typos found in DocBook/filesystem.xml.
It is because the file was generated from comments in code,
I have to fix the comments in codes, instead of xml file.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 7f277e4..76579c28 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -304,7 +304,7 @@
  * Locate any valid recovery information from the journal and set up the
  * journal structures in memory to ignore it (presumably because the
  * caller has evidence that it is out of date).
- * This function does'nt appear to be exorted..
+ * This function doesn't appear to be exported..
  *
  * We perform one pass over the journal to allow us to tell the user how
  * much recovery information is being erased, and to let us initialise
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 6b8338e..98d04c5 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -543,7 +543,7 @@
  *
  * Some transactions, such as large extends and truncates, can be done
  * atomically all at once or in several stages.  The operation requests
- * a credit for a number of buffer modications in advance, but can
+ * a credit for a number of buffer modifications in advance, but can
  * extend its credit if it needs more.
  *
  * jbd2_journal_extend tries to give the running handle more buffer credits.
@@ -627,7 +627,7 @@
  * If the jbd2_journal_extend() call above fails to grant new buffer credits
  * to a running handle, a call to jbd2_journal_restart will commit the
  * handle's transaction so far and reattach the handle to a new
- * transaction capabable of guaranteeing the requested number of
+ * transaction capable of guaranteeing the requested number of
  * credits. We preserve reserved handle if there's any attached to the
  * passed in handle.
  */
@@ -1596,7 +1596,7 @@
 
 /**
  * int jbd2_journal_stop() - complete a transaction
- * @handle: tranaction to complete.
+ * @handle: transaction to complete.
  *
  * All done for a particular handle.
  *