[6.2] Prevent accessing unicode scalar element with incorrect index. (#1214) #1219
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Explanation: This change prevents a potential DocC crash by making sure that it does not access an array element using an index that is outside of the bonds of the array.
Scope: Fixes crash of some documentation when building with Linux and Swift 5.9
Issues: rdar://150760264
Original PRs: #1214
Risk: Low.
Testing: Automated tests have been added and manual test has been made.
Reviewers: @anferbui @d-ronnqvist @QuietMisdreavus @patshaughnessy