chore(storage): modify documentation to remove 'internal only' from MPU APIs #17165

Job	Run time
gapic-bom	1m 46s
package_name_check	1m 1s
group_id_check_for_maps_libraries	7m 11s
gitignore_correctness	1m 2s
owlbot-py	1m 11s
generate-readme	1m 13s
root-pom	1m 53s
owlbot-yaml	1m 2s
	16m 19s

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