Document default 75% value for GCHeapHardLimitPercent in container environments

[Copilot]

Summary

The GCHeapHardLimit section documents that containers default to "75% of the memory limit" but this information was missing from GCHeapHardLimitPercent. Updated the first bullet point in the "Heap hard limit percent" section to:

• Clarify that in memory-constrained environments (containers), the container limit is considered the total physical memory
• Document that the default value is 75% when running in memory-constrained environments

Original prompt

This line

If this limit isn't configured but the process is running in a memory-constrained environment, that is, inside a container with a specified memory limit, a default value is set. That default is the greater of 20 MB or 75% of the memory limit on the container.

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[agocke]

@copilot I believe this would read better as:
Specifies the heap hard limit as a percentage of the total physical memory. If the process is running in a memory-constrained environment, that is, inside a container with a specified memory limit, the total physical memory is the memory limit; otherwise it's what's available on the machine.

[agocke]

@copilot I believe this would read better as:
Specifies the heap hard limit as a percentage of the total physical memory. If the process is running in a memory-constrained environment, that is, inside a container with a specified memory limit, the container limit is considered the total physical memory. If in a memory-constrained environment, the default value is 75%.

[Copilot]

@copilot I believe this would read better as:
Specifies the heap hard limit as a percentage of the total physical memory. If the process is running in a memory-constrained environment, that is, inside...

Updated the wording as suggested in commit f552eb5.