docs: fix TypeScript capitalization in streamable HTTP example #2187

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	37s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.11, locked, windows-latest)	2m 43s
checks / test (3.10, locked, windows-latest)	2m 36s
checks / test (3.12, lowest-direct, windows-latest)	3m 22s
checks / test (3.14, lowest-direct, windows-latest)	2m 39s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, windows-latest)	1m 57s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.13, locked, windows-latest)	2m 16s
checks / test (3.11, lowest-direct, windows-latest)	2m 35s
checks / test (3.13, lowest-direct, windows-latest)	3m 22s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.13, locked, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 21s
checks / test (3.12, locked, windows-latest)	3m 24s
checks / test (3.11, locked, ubuntu-latest)	55s
all-green	5s
	40m 27s

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