Update the language to be more up front about Determinate Nix #2781

Job	Run time
Lints	1m 57s
build-aarch64-darwin / Build aarch64 Darwin (static)	3m 46s
build-aarch64-linux / Build aarch64 Linux (static)	8m 4s
build-x86_64-darwin / Build x86_64 Darwin (static)	6m 20s
build-x86_64-linux / Build x86_64 Linux (static)	5m 10s
Run x86_64 Linux (--determinate)	5m 3s
Run x86_64 Linux (No init, --determinate)	3m 22s
Run x86_64 Linux (No init)	6m 46s
Run x86_64 Linux	4m 12s
Run x86_64 Linux release check matrix	0s
Run x86_64 Linux release checks	0s
Run aarch64 Darwin (--determinate)	2m 10s
Run aarch64 Darwin	2m 15s
Run aarch64 Linux (--determinate)	1m 30s
Run aarch64 Linux	1m 18s
Run x86_64 Darwin (--determinate)	5m 24s
Run x86_64 Darwin	5m 54s
	1h 3m 11s

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