Documentation for adding normal variables to group is incorrect

The documentation claims: _Variables in format key=value space separated pairs. Secret variables should be managed using az pipelines variable-group variable commands._

However, when doing so, those variables are created under one variable, they are not parsed and created separately.

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#### Document Details

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* ID: a067cc50-3fa1-3f19-1c8f-d0077be070d8
* Version Independent ID: 6a0e745f-e9ee-644a-85ce-db299b10551d
* Content: [az pipelines variable-group](https://docs.microsoft.com/en-us/cli/azure/pipelines/variable-group?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/pipelines/variable-group.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/latest/docs-ref-autogen/pipelines/variable-group.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**