docs: fix simple typo, maximim -> maximum
There is a small typo in libnczarr/zvar.c.
Should read `maximum` rather than `maximim`.
@@ -258,7 +258,7 @@ give_var_secret_name(NC_VAR_INFO_T *var, const char *name)
* @param ncid File ID.
* @param name Name.
* @param xtype Type.
- * @param ndims Number of dims. ZARR has maximim of 32.
+ * @param ndims Number of dims. ZARR has maximum of 32.
* @param dimidsp Array of dim IDs.
* @param varidp Gets the var ID.
*
