example in header

Former-commit-id: 26299e34b9b043f0ced40114e65d49e1c9a31381

include/igl/basename.h

@@ -13,7 +13,7 @@
 
 namespace igl
 {
-  // Function like PHP's basename
+  // Function like PHP's basename: /etc/sudoers.d --> sudoers.d
   // Input:
   //  path  string containing input path
   // Returns string containing basename (see php's basename)

include/igl/dirname.h

@@ -13,7 +13,7 @@
 
 namespace igl
 {
-  // Function like PHP's dirname
+  // Function like PHP's dirname: /etc/passwd --> /etc, 
   // Input:
   //  path  string containing input path
   // Returns string containing dirname (see php's dirname)