doc: Document !2009

doc/changes/ipc/mr.2009.1.md

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+all: Add ability to do more complex IPC communication by introducing VLA
+functions. These lets us do the marshalling to some extent oursevles, useful
+for sending a non-fixed amount of data. Currently only supports non-fixed sized
+messages coming back from the server.

doc/changes/ipc/mr.2009.2.md

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+all: Add variable length get views function.