[PQO][Dataflows] Update load to existing table documentation for GA

[ok-AK]

Changes:

• Remove Preview tags.
• Update images to latest user experience.
• Drop Import Method references. Update language to updated user experience.

[learn-build-service-prod]

Learn Build status updates of commit 6dda74d:

✅ Validation status: passed

File	Status	Preview URL	Details
powerquery-docs/dataflows/add-data-power-query.md	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/column-mapping.png	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/import-method-selection.png	✅Succeeded	n/a (file deleted or renamed)
powerquery-docs/dataflows/media/add-data-power-query/recommended-tables.png	✅Succeeded

For more details, please refer to the build report.

[ok-AK]

@microsoft-github-policy-service agree company="Microsoft"

[prmerger-automator]

@ok-AK : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[v-dirichards]

@Luitwieler

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[learn-build-service-prod]

Learn Build status updates of commit b730808:

✅ Validation status: passed

File	Status	Preview URL	Details
powerquery-docs/dataflows/add-data-power-query.md	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/column-mapping.png	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/import-method-selection.png	✅Succeeded	n/a (file deleted or renamed)
powerquery-docs/dataflows/media/add-data-power-query/recommended-tables.png	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.
Image File	This PR added or updated an image file(s).

[learn-build-service-prod]

Learn Build status updates of commit 4019aa7:

✅ Validation status: passed

File	Status	Preview URL	Details
powerquery-docs/dataflows/add-data-power-query.md	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/column-mapping.png	✅Succeeded
powerquery-docs/dataflows/media/add-data-power-query/import-method-selection.png	✅Succeeded	n/a (file deleted or renamed)
powerquery-docs/dataflows/media/add-data-power-query/recommended-tables.png	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.
Image File	This PR added or updated an image file(s).