docs: Refactor merge sort code example to use literalinclude #5719

Job	Run time
unpack-envvars	1s
flyteadmin integration tests image / build_docker	5m 7s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	5m 43s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	4m 18s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	4m 14s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	32s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	5m 59s
Dry Run Goreleaser	7m 25s
Test Getting started	15m 23s
Check Go Generate (datacatalog) / Go Generate	1m 47s
Check Go Generate (flyteadmin) / Go Generate	2m 22s
Check Go Generate (flytecopilot) / Go Generate	1m 45s
Check Go Generate (flytectl) / Go Generate	2m 27s
Check Go Generate (flytepropeller) / Go Generate	2m 27s
Lint (datacatalog) / Run Lint	2m 39s
Lint (flyteadmin) / Run Lint	3m 15s
Lint (flytecopilot) / Run Lint	2m 0s
Lint (flytectl) / Run Lint	2m 39s
Lint (flyteidl) / Run Lint	1m 56s
Lint (flyteplugins) / Run Lint	3m 6s
Lint (flytestdlib) / Run Lint	2m 39s
Lint (flytepropeller) / Run Lint	3m 17s
Unit Tests (datacatalog) / Run Unit Test	2m 55s
Unit Tests (flyteadmin) / Run Unit Test	4m 43s
Unit Tests (flytecopilot) / Run Unit Test	2m 36s
Unit Tests (flytectl) / Run Unit Test	3m 30s
Unit Tests (flytepropeller) / Run Unit Test	4m 15s
Unit Tests (flyteplugins) / Run Unit Test	4m 3s
Unit Tests (flytestdlib) / Run Unit Test	3m 42s
Integration Test (flyteadmin) / Integration tests	5m 47s
	1h 52m 32s

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