Clarify that TFE_PARALLELISM has no effect in Terraform Cloud #529
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What
This PR updates the documentation for the TFE_PARALLELISM environment variable to clarify that it only affects local CLI execution and has no effect in Terraform Cloud remote operations. The update also includes guidance on using TF_CLI_ARGS_plan and TF_CLI_ARGS_apply as the supported method for configuring parallelism in Terraform Cloud.
Why
Although TFE_PARALLELISM was previously used in remote operations, its behavior has changed, and it is now ignored by Terraform Cloud. This clarification helps prevent confusion for users expecting it to influence parallelism in remote runs.
Changes
Related discussion
This change follows up on the discussion in hashicorp/terraform-docs-common#908, where it was noted that the current paragraph may mislead users into thinking TFE_PARALLELISM is effective in Terraform Cloud.