Fix an untranslated command in an example: SHOW -> MUESTRA
Remove trailing whitespace.
Remove spurious line breaks in <userinput> tags
Fix untranslated procedure name in example: TO -> PARA
Fix typo in link text: ABIEROS -> ABIERTOS
Fix untranslated procedure name in example: LPUT -> PONULTIMO
Fix untranslated link text: BUTFIRST -> MENOSPRIMERO