Fix typo in README.md "block loop if ELF files" in picotool create

[d-c-d]

Fix typo in README.md "block loop if ELF files" in picotool create

Should read: "This command allows you to create partition tables, and additionally embed them into the block loop of ELF files (for example, for bootloaders)."

[will-v-pi]

Merged into develop