Fix typos

Typos found with codespell.

vlf-tune.el

@@ -60,7 +60,9 @@ but don't change batch size.  If t, measure and change."
                                (if ram-size
                                    (/ ram-size 20)
                                  0))
-                             large-file-warning-threshold)
+                             (if large-file-warning-threshold
+                                 large-file-warning-threshold
+                               0))
   "Maximum batch size in bytes when auto tuning.
 Avoid increasing this after opening file with VLF."
   :group 'vlf :type 'integer)
@@ -385,7 +387,7 @@ Optimize over TYPES up to MAX-IDX."
 (defun vlf-tune-batch (types &optional linear file)
   "Adjust `vlf-batch-size' to optimal value optimizing on TYPES.
 TYPES is alist of elements that may be of form (type coef) or
-non list values in which case coeficient is assumed 1.
+non list values in which case coefficient is assumed 1.
 Types can be :insert, :raw, :encode, :write, :hexl or :dehexlify.
 If LINEAR is non nil, use brute-force.  In case requested measurement
 is missing, stop search and set `vlf-batch-size' to this value.