message: Fix a hint text
diff: </TEXT>
  <TEXT>
  <Tag>TXT_KEY_HINT_DOC_19</Tag>
  - <English>In Dawn of Civilization, vassals do not have to give up tile control their masters in the first ring around their cities.</English>
  + <English>In Dawn of Civilization, vassals do not have to give up tile control to their masters in the first ring around their cities.</English>
  </TEXT>
  <TEXT>
  <Tag>TXT_KEY_HINT_DOC_20</Tag>
  