Fix minor typos in docs and comments.

fs/cromfs/README.txt

@@ -155,7 +155,7 @@ block can be converted to an absolute address in the in-memory CROMFS image
 by simply adding that offset to the well-known address of the volume header.
 
 Each hard link, directory, and file node in the directory list includes
-such a "peer offset" to to the next node in the list.  Each node is followed
+such a "peer offset" to the next node in the list.  Each node is followed
 by the NUL-terminated name of the node.  Each node also holds an additional
 offset.  Directory nodes contain a "child offset".  That is, the offset to
 the first entry in another singly linked list of nodes comprising the sub-

fs/smartfs/smartfs_utils.c

@@ -1659,7 +1659,7 @@ errout:
  * Name: smartfs_shrinkfile
  *
  * Description:
- *   Shrink the size existing file to to the specified length
+ *   Shrink the size of an existing file to the specified length
  *
  ****************************************************************************/
 

fs/vfs/fs_rename.c

@@ -263,7 +263,7 @@ next_subdir:
    *
    * Remove the old inode.  Because we hold a reference count on the
    * inode, it will not be deleted now.  It will be deleted when all of
-   * the references to to the inode have been released (perhaps when
+   * the references to the inode have been released (perhaps when
    * inode_release() is called in remove()).  inode_remove() should return
    * -EBUSY to indicate that the inode was not deleted now.
    */

fs/vfs/fs_unlink.c

@@ -199,7 +199,7 @@ int unlink(FAR const char *pathname)
 
           /* Remove the old inode.  Because we hold a reference count on the
            * inode, it will not be deleted now.  It will be deleted when all
-           * of the references to to the inode have been released (perhaps
+           * of the references to the inode have been released (perhaps
            * when inode_release() is called below).  inode_remove() will
            * return -EBUSY to indicate that the inode was not deleted now.
            */