Issues in Section 6.6

[hlef]

There are a few things which would be nice to fix in Section 6.6. ("Ensuring that heap objects are not deallocated"):

• This paragraph should probably mention that a heap claim only lasts a specific amount of time. When does the claim expire? I am myself not clear about this.
• https://github.com/CHERIoT-Platform/book/blob/main/text/memory.adoc?plain=1#L135 The links to heap_claim and heap_free do not lead anywhere. Is that intentional? If so, it may be better to remove the links altogether.
• https://github.com/CHERIoT-Platform/book/blob/main/text/memory.adoc?plain=1#L141 Here it looks like the sentence isn't finished. I do not understand what the note is meant to say.

[davidchisnall]

Please can you use the 'create permalink' option when creating links? I don't think either of these go to the place that you want anymore.