doc: comments on PackageRegistry
#10333
| Job | Run time |
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| 3m 0s | |
| 11m 31s | |
| 3m 26s | |
| 1m 58s | |
| 12s | |
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| 2m 46s | |
| 12s | |
| 21s | |
| 8m 43s | |
| 13m 56s | |
| 14m 13s | |
| 15m 36s | |
| 25m 53s | |
| 21m 50s | |
| 13m 48s | |
| 19m 11s | |
| 27m 27s | |
| 0s | |
| 0s | |
| 3h 6m 15s |