docs: update the readme since deprecate vscode azure account

[wenytang-ms]

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README.md:116

• [nitpick] Ensure consistency in naming throughout the document. The change from "Azure Account and Sign-In" to "Azure API Management" should be consistent.

To select which subscriptions show up in the extension's explorer, click on the "Select Subscriptions..." button on any subscription node (indicated by a "filter" icon when you hover over it), or select "View->Command Palette" and search for "Azure API Management: Select Subscriptions".