Update MSAL Python docs (overview and getting started sections)

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msal-python-conceptual/getting-started/acquiring-tokens.md

• Line 0, Column 0: [Warning: pivot-group-missing - See documentation] Missing metadata attribute: 'zone_pivot_groups'. To use zone pivots in your file, you must specify the valid pivot group that contains the pivot IDs you want to use.
• Line 1, Column 1: [Warning: author-missing - See documentation] Missing required attribute: 'author'. Add the current author's GitHub ID.
• Line 1, Column 1: [Warning: title-missing - See documentation] Missing required attribute: 'title'. Add a title string to show in search engine results.
• Line 1, Column 1: [Warning: ms-author-missing - See documentation] Missing required attribute: 'ms.author'. Add the current author's Microsoft alias.
• Line 13, Column 1: [Warning: yaml-header-syntax-error - See documentation] While parsing a block mapping, did not find expected key.
• Line 1, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

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