spell check

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275171 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/exec.html

@@ -178,7 +178,7 @@ interpretation of exit codes.</p>
     <td valign="top">resolveExecutable</td>
     <td valign="top">When this attribute is true, the name of the executable
                      if resolved firstly against the project basedir and
-                     if that doe snot exist, against the execution
+                     if that does not exist, against the execution
                      directory if specified. On Unix systems, if you only 
                      want to allow execution of commands in the user's path, 
                      set this to false.</td>