docs: fix duplicate words and 'subwrod' typos in cannon NatSpec

[0xAxiom]

Summary

Comment/NatSpec-only fixes for typos that have been sitting in the cannon files since their introduction (Feb 22 commit 27731f5):

• `src/cannon/MIPS64.sol` — `loadSubWord` NatSpec: `the the subword` → `the subword`; `subwrod` → `subword`
• `src/cannon/libraries/MIPS64Instructions.sol` — `selectSubWord` NatSpec: `the the subword` → `the subword`; `subwrod` → `subword`
• `scripts/deploy/DeployOPChain.s.sol` — inline comment: `because to to update` → `because to update`

- /// @param _vaddr The virtual address of the the subword.
+ /// @param _vaddr The virtual address of the subword.

- /// @param _signExtend Whether to sign extend the selected subwrod.
+ /// @param _signExtend Whether to sign extend the selected subword.

- // because to to update to the permissionless game, we will need to update its starting
+ // because to update to the permissionless game, we will need to update its starting

No behavior change — strings/identifiers/Solidity code are untouched, only NatSpec and inline comments.

GPG-signed.

[cb-heimdall]

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