docs(oft-solana): elaborate on adapters

[nazreen]

No description provided.

[nazreen]

Failing check has the following error log:

@layerzerolabs/devtools-evm-hardhat-test:test: Error: ⤫ Safe config validation failed for network: ethereum
@layerzerolabs/devtools-evm-hardhat-test:test:     at SimpleTaskDefinition.action6 [as action] (/app/packages/devtools-evm-hardhat/dist/tasks/index.js:816:15)
@layerzerolabs/devtools-evm-hardhat-test:test:     at async Environment._runTaskDefinition (/app/node_modules/.pnpm/hardhat@2.22.12_ts-node@10.9.2_typescript@5.5.3/node_modules/hardhat/src/internal/core/runtime-environment.ts:351:14)
@layerzerolabs/devtools-evm-hardhat-test:test:     at async Environment.run (/app/node_modules/.pnpm/hardhat@2.22.12_ts-node@10.9.2_typescript@5.5.3/node_modules/hardhat/src/internal/core/runtime-environment.ts:184:14)
@layerzerolabs/devtools-evm-hardhat-test:test:     at async main (/app/node_modules/.pnpm/hardhat@2.22.12_ts-node@10.9.2_typescript@5.5.3/node_modules/hardhat/src/internal/cli/cli.ts:322:7)

I don't see how this is related to the diff of this PR, which modifies only the README.md for oft-solana