client: Extended the FileHandle::Close() documentation to clarify that the libxtreemfs does not count the number of pending operations and the user of the library has to do that on his own before Close()ing the FileHandle.
client: Extended the FileHandle::Close() documentation to clarify that the libxtreemfs does not count the number of pending operations and the user of the library has to do that on his own before Close()ing the FileHandle.

git-svn-id: 4a24f560d5bb049edaa12cbc2145b2f5ee41c6a2@2817 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534

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