Documentation change: Incorrect text reference

[girish-hari]

Describe the bug
In this page:
https://codelabs.developers.google.com/codelabs/mdc-101-kotlin#1

To open the XML file's code, it is written:
switch from the "Design" tab to the "Text" tab

In Android Studio 4.1.3, the "Text" tab is shown as "Code". This may confuse first-time users of Android Studio.

To Reproduce
Not Applicable. Clearly explained in screenshots

Expected behavior
This is more of a documentation change.

Screenshots
Added below

Codelab details (please complete the following information about the codelab):

• Level MDC-101
• Language Kotlin
• Link to the codelab at the step with the issue - https://codelabs.developers.google.com/codelabs/mdc-101-kotlin#1

Additional context
Add any other context about the problem here.