fix(docs): add .slice(2) to dataSuffix hex stripping in builder codes…

[0xchainer]

Problem

In tmp-builder-codes-outline.mdx, the dataSuffix hex stripping is inconsistent across examples. Some examples correctly strip the 0x prefix (dataSuffix.slice(2)) but the EOA and ERC-4337 sections don't:

• tx.data = tx.data + dataSuffix;
• userOp.callData = userOp.callData + dataSuffix;
  Since dataSuffix has 0x prefix, this produces malformed double-prefixed hex strings.

Fix

Added .slice(2) to both:

• tx.data = tx.data + dataSuffix.slice(2);
• userOp.callData = userOp.callData + dataSuffix.slice(2);
  Matches existing pattern in lines 164, 175, 307, 319.
  Closes [Bug] Inconsistent dataSuffix hex stripping: slice(2) used in some examples but not others #1474

[cb-heimdall]

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