bug#40671: [DOC] modify literal objects

[Mattias Engdegård]

tags 40671 patch
stop

[Sorry about the truncated message.]

> Can we modify literal objects? 

No, and the manual should do a much better job at explaining this. At the very 
least it should not promulgate bad ideas by including mutation of literals in 
example code. Patch attached, suggested for emacs-27.

We should not even try to show what happens when the user breaks the rule, 
because it is undefined.

0001-Don-t-mutate-literals-in-manual-examples-bug-40671.patch
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