docs(samples): adding speech quickstart and snippets for v2

[hpkaur86]

Description

Fixes #<ISSUE-NUMBER>

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Checklist

• [x] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [ ] Tests pass: go test -v ./.. (see Testing)
• [x] Code formatted: gofmt (see Formatting)
• [ ] Vetting pass: go vet (see Formatting)
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

• speech/speech_quickstart_v2/main.go:15, tag speech_quickstart_v2

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[hpkaur86]

updated

[hpkaur86]

Updated as requested. Please review. Thank you

[hpkaur86]

@muncus Need your review. Thanks in Advance