db/MySQL: fix HTML manual nested <ul></ul> element position (#4778)

* db/MySQL: fix HTML manual nested `<ul></ul>` element position

Fix `HTMLParser()` class instance find nested `<ul>` end element `</ul>`
error during compilation GRASS GIS source code:

```
Error (IndexError('pop from empty list'))
```

Problematic is nested `<ul></ul>` HTML element inside parent `<ul></ul>`
element:

```
 <ul>
     <li></li>
     <li></li>
      <ul>
          <li></li>
          <li></li>
          <li></li>
      </ul>
 </ul>
```

Expected nested `<ul></ul>` HTML element inside parent `<ul></ul>` is
nested position inside `<li></li>` element.

```
<ul>
    <li></li>
    <li>
        <ul>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </li>
</ul>
```

* Fix typo of key word

db/drivers/mysql/grass-mysql.html

@@ -27,14 +27,15 @@ <h2>Driver and database name</h2>
 The parameter 'database' can be given in two formats:
 
 <ul>
-    <li> Database name - in case of connection from localhost
-    <li> String of comma separated list of kye=value options.
+    <li> Database name - in case of connection from localhost</li>
+    <li> String of comma separated list of key=value options.
          Supported options are:
-	 <ul>
-	     <li> dbname - database name
-	     <li> host - host name or IP address
-	     <li> port - server port number
-	 </ul>
+        <ul>
+            <li> dbname - database name</li>
+            <li> host - host name or IP address</li>
+            <li> port - server port number</li>
+        </ul>
+    </li>
 </ul>
 <p>
 Examples of connection parameters: