kvs: add rst format to inline docs #9993

Job	Run time
Generate build matrix	8s
spelling	5s
validate commits	13s
python linting	27s
bookworm - test-install	9m 38s
bookworm - 32 bit	9m 40s
noble - test-install	9m 37s
el9 - test-install	9m 40s
alpine - test-install	9m 41s
fedora40 - test-install	9m 36s
jammy - test-install	9m 38s
focal - py3.8	9m 36s
bookworm - gcc-12,content-s3,distcheck	9m 37s
fedora40 - clang-18	9m 36s
coverage	9m 43s
el8 - ascii	9m 36s
el8 - test-install	9m 37s
el8 - system,coverage	7m 25s
inception	9m 36s
flux-pam check	0s
flux-pmix check	0s
flux-accounting check	0s
macos build only	0s
flux-sched check	0s
Generate docker manifest	1s
	2h 23m 10s

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