Fixed small typo in GetAccountHierarchy example.
Fixed small typo in GetAccountHierarchy example.

git-svn-id: 1b0641ce8ae3d8a6f1cb54ba7636cb3f184f414a@114 bd846e36-b2c2-11de-ae6a-cd50274c347e

Parmjit01/google-api-adwords-php,medio/Google-Adwords-API-PHP,medio/Google-Adwords-API-PHP,medio/Google-Adwords-API-PHP,tectronics/google-api-adwords-php,surapan2521/google-api-adwords-php