is_{read,writ}able: correct typo

Author: scivision

+stdlib/is_readable.m

@@ -9,7 +9,7 @@
 
 a = file_attributes(p);
 
-ok = ~isempty(a) && (a.UserRead || v.GroupRead || v.OtherRead);
+ok = ~isempty(a) && (a.UserRead || a.GroupRead || a.OtherRead);
 
 end
 

+stdlib/is_writable.m

@@ -9,7 +9,7 @@
 
 a = file_attributes(p);
 
-ok = ~isempty(a) && (a.UserWrite || v.GroupWrite || v.OtherWrite);
+ok = ~isempty(a) && (a.UserWrite || a.GroupWrite || a.OtherWrite);
 
 end