Update xfunc.sgml

--  不用转义

Author: ChenHuajun

postgresql/doc/src/sgml/xfunc.sgml

@@ -1605,7 +1605,7 @@ SELECT mleast(10, -1, 5, 4.4);
      array, as if you had written
 
 <screen>
-SELECT mleast(ARRAY[10, -1, 5, 4.4]);    -&minus; doesn't work
+SELECT mleast(ARRAY[10, -1, 5, 4.4]);    -- doesn't work
 </screen>
 
      You can't actually write that, though &mdash; or at least, it will
@@ -1634,7 +1634,7 @@ SELECT mleast(10, -1, 5, 4.4);
      实际上，所有实际参数在<literal>VARIADIC</literal>位置或之后都被收集到一个一维数组中，就好像你写了
 
 <screen>
-SELECT mleast(ARRAY[10, -1, 5, 4.4]);    -&minus; 不起作用
+SELECT mleast(ARRAY[10, -1, 5, 4.4]);    -- 不起作用
 </screen>
 
      但实际上你不能这样写 &mdash; 或者至少，它不会匹配这个函数定义。标记为
@@ -4335,7 +4335,7 @@ ________________________________________________________-->
         </row>
 ________________________________________________________-->
         <row>
-         <entry><type>float8</type> (<type>双精度</type>)</entry>
+         <entry><type>float8</type> (<type>double precision</type>)</entry>
          <entry><type>float8</type></entry>
          <entry><filename>postgres.h</filename></entry>
         </row>