docs: fs: fix broken links to vfs.txt with was renamed to vfs.rst

A recent documentation conversion renamed this file but forgot
to update the links.

Fixes: af96c1e3 ("docs: filesystems: vfs: Convert vfs.txt to RST")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/porting

@@ -330,14 +330,14 @@ unreferenced dentries, and is now only called when the dentry refcount goes to
 [mandatory]
 
 	.d_compare() calling convention and locking rules are significantly
-changed. Read updated documentation in Documentation/filesystems/vfs.txt (and
+changed. Read updated documentation in Documentation/filesystems/vfs.rst (and
 look at examples of other filesystems) for guidance.
 
 ---
 [mandatory]
 
 	.d_hash() calling convention and locking rules are significantly
-changed. Read updated documentation in Documentation/filesystems/vfs.txt (and
+changed. Read updated documentation in Documentation/filesystems/vfs.rst (and
 look at examples of other filesystems) for guidance.
 
 ---
@@ -377,12 +377,12 @@ where possible.
 the filesystem provides it), which requires dropping out of rcu-walk mode. This
 may now be called in rcu-walk mode (nd->flags & LOOKUP_RCU). -ECHILD should be
 returned if the filesystem cannot handle rcu-walk. See
-Documentation/filesystems/vfs.txt for more details.
+Documentation/filesystems/vfs.rst for more details.
 
 	permission is an inode permission check that is called on many or all
 directory inodes on the way down a path walk (to check for exec permission). It
 must now be rcu-walk aware (mask & MAY_NOT_BLOCK).  See
-Documentation/filesystems/vfs.txt for more details.
+Documentation/filesystems/vfs.rst for more details.
  
 --
 [mandatory]
@@ -625,7 +625,7 @@ in your dentry operations instead.
 --
 [mandatory]
 	->clone_file_range() and ->dedupe_file_range have been replaced with
-	->remap_file_range().  See Documentation/filesystems/vfs.txt for more
+	->remap_file_range().  See Documentation/filesystems/vfs.rst for more
 	information.
 --
 [recommended]

include/linux/dcache.h

@@ -153,7 +153,7 @@ struct dentry_operations {
  * Locking rules for dentry_operations callbacks are to be found in
  * Documentation/filesystems/Locking. Keep it updated!
  *
- * FUrther descriptions are found in Documentation/filesystems/vfs.txt.
+ * FUrther descriptions are found in Documentation/filesystems/vfs.rst.
  * Keep it updated too!
  */
 
@@ -568,7 +568,7 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
  * If dentry is on a union/overlay, then return the underlying, real dentry.
  * Otherwise return the dentry itself.
  *
- * See also: Documentation/filesystems/vfs.txt
+ * See also: Documentation/filesystems/vfs.rst
  */
 static inline struct dentry *d_real(struct dentry *dentry,
 				    const struct inode *inode)

include/linux/fs.h

@@ -1769,7 +1769,7 @@ struct block_device_operations;
 /*
  * These flags control the behavior of the remap_file_range function pointer.
  * If it is called with len == 0 that means "remap to end of source file".
- * See Documentation/filesystems/vfs.txt for more details about this call.
+ * See Documentation/filesystems/vfs.rst for more details about this call.
  *
  * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate)
  * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request