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>

fs/jbd2/recovery.c

@@ -304,7 +304,7 @@ int jbd2_journal_recover(journal_t *journal)
  * 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  * caller has evidence that it is out of date).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

fs/jbd2/transaction.c

@@ -543,7 +543,7 @@ EXPORT_SYMBOL(jbd2_journal_start_reserved);
  *
  * 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 @@ int jbd2_journal_extend(handle_t *handle, int nblocks)
  * 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_forget (handle_t *handle, struct buffer_head *bh)
 
 /**
  * int jbd2_journal_stop() - complete a transaction
- * @handle: tranaction to complete.
+ * @handle: transaction to complete.
  *
  * All done for a particular handle.
  *

fs/super.c

@@ -285,7 +285,7 @@ static void put_super(struct super_block *sb)
  *	deactivate_locked_super	-	drop an active reference to superblock
  *	@s: superblock to deactivate
  *
- *	Drops an active reference to superblock, converting it into a temprory
+ *	Drops an active reference to superblock, converting it into a temporary
  *	one if there is no other active references left.  In that case we
  *	tell fs driver to shut it down and drop the temporary reference we
  *	had just acquired.