kvs: add rst format to inline docs #10063

Job	Run time
spelling	6s
validate commits	9s
Generate build matrix	7s
python linting	31s
bookworm - test-install	13m 10s
bookworm - 32 bit	13m 40s
noble - test-install	12m 26s
el9 - test-install	12m 9s
alpine - test-install	12m 10s
fedora40 - test-install	11m 59s
jammy - test-install	11m 46s
focal - py3.8	16m 40s
bookworm - gcc-12,content-s3,distcheck	19m 22s
fedora40 - clang-18	16m 43s
coverage	24m 13s
el8 - ascii	19m 9s
el8 - test-install	13m 7s
el8 - system,coverage	7m 15s
inception	21m 59s
flux-pmix check	13m 0s
flux-sched check	6m 48s
flux-accounting check	4m 33s
macos build only	2m 59s
flux-pam check	4m 16s
Generate docker manifest	1s
	4h 18m 18s

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