docs(API docs): Fix pg.queries example

Author: nfroidure

API.md

@@ -67,7 +67,7 @@ Executes the given queries in parallel (using the connections pool)
 **Returns**: <code>Array.&lt;String&gt;</code> - Queries to execute<code>Object</code> - Arguments hashes for the queries  
 **Example**  
 ```js
-const { rows, fields } = await pg.queries([
+const [{ rows, fields }, { rows2, fields2 }] = await pg.queries([
    'SELECT * FROM users WHERE user = $$userId',
    'SELECT * FROM users WHERE user = $$userId',
 ], { userId: 1 });

README.md

@@ -98,7 +98,7 @@ Executes the given queries in parallel (using the connections pool)
 **Returns**: <code>Array.&lt;String&gt;</code> - Queries to execute<code>Object</code> - Arguments hashes for the queries  
 **Example**  
 ```js
-const { rows, fields } = await pg.queries([
+const [{ rows, fields }, { rows2, fields2 }] = await pg.queries([
    'SELECT * FROM users WHERE user = $$userId',
    'SELECT * FROM users WHERE user = $$userId',
 ], { userId: 1 });

src/pg.js

@@ -104,7 +104,7 @@ async function initPGService({ ENV = {}, PG = {}, log = noop }) {
    * @return {Array<String>}   Queries to execute
    * @return {Object}          Arguments hashes for the queries
    * @example
-   * const { rows, fields } = await pg.queries([
+   * const [{ rows, fields }, { rows2, fields2 }] = await pg.queries([
    *    'SELECT * FROM users WHERE user = $$userId',
    *    'SELECT * FROM users WHERE user = $$userId',
    * ], { userId: 1 });