Grammar change

gistfile1.txt

```html
<emu-grammar>
  ClassElement[Yield, Await] :
    MethodDefinition[?Yield, ?Await]
    `static` MethodDefinition[?Yield, ?Await]
    <ins>FieldDefinition[?Yield, ?Await] `;`</ins>
    `;`

  MemberExpression[Yield, Await] :
    PrimaryExpression[?Yield, ?Await]
    MemberExpression[?Yield, ?Await] `[` Expression[+In, ?Yield, ?Await] `]`
    MemberExpression[?Yield, ?Await] `.` IdentifierName
    MemberExpression[?Yield, ?Await] TemplateLiteral[?Yield, ?Await]
    SuperProperty[?Yield, ?Await]
    MetaProperty
    `new` MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]
    <ins>MemberExpression[?Yield, ?Await] `.` PrivateIdentifier</ins>

  CallExpression[Yield, Await] :
    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] #callcover
    SuperCall[?Yield, ?Await]
    CallExpression[?Yield, ?Await] Arguments[?Yield, ?Await]
    CallExpression[?Yield, ?Await] `[` Expression[+In, ?Yield, ?Await] `]`
    CallExpression[?Yield, ?Await] `.` IdentifierName
    CallExpression[?Yield, ?Await] TemplateLiteral[?Yield, ?Await]
    <ins>CallExpression[?Yield, ?Await] `.` PrivateIdentifier</ins>
</emu-grammar>
```

becomes

```html
<emu-grammar ecc-id="class-element">
  ClassElement[Yield, Await] :
    MethodDefinition[?Yield, ?Await]
    `static` MethodDefinition[?Yield, ?Await]
    <ins>FieldDefinition[?Yield, ?Await] `;`</ins>
    `;`
</emu-grammar>
<emu-grammar ecc-id="member-expression">
  MemberExpression[Yield, Await] :
    PrimaryExpression[?Yield, ?Await]
    MemberExpression[?Yield, ?Await] `[` Expression[+In, ?Yield, ?Await] `]`
    MemberExpression[?Yield, ?Await] `.` IdentifierName
    MemberExpression[?Yield, ?Await] TemplateLiteral[?Yield, ?Await]
    SuperProperty[?Yield, ?Await]
    MetaProperty
    `new` MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]
    <ins>MemberExpression[?Yield, ?Await] `.` PrivateIdentifier</ins>
</emu-grammar>
<emu-grammar ecc-id="call-expression">
  CallExpression[Yield, Await] :
    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] #callcover
    SuperCall[?Yield, ?Await]
    CallExpression[?Yield, ?Await] Arguments[?Yield, ?Await]
    CallExpression[?Yield, ?Await] `[` Expression[+In, ?Yield, ?Await] `]`
    CallExpression[?Yield, ?Await] `.` IdentifierName
    CallExpression[?Yield, ?Await] TemplateLiteral[?Yield, ?Await]
    <ins>CallExpression[?Yield, ?Await] `.` PrivateIdentifier</ins>
</emu-grammar>
```