typo in admin.texinfo

typo in admin.texinfo

pull up r22266 from trunk

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 r22266 | ghudson | 2009-04-22 10:26:17 +0200 (Wed, 22 Apr 2009) | 4 lines

 In the cross-realm setup example in the admin documentation, use
 "addprinc" instead of "add_princ" since the latter is not a recognized
 alias for add_principal.

ticket: 6503
version_fixed: 1.7
target_version: 1.7
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22388 dc483132-0cff-0310-8789-dd5450dbe970