Update EIP-7907: add hyperlinks

Merged by EIP-Bot.

Author: gap-editor

EIPS/eip-7907.md

@@ -23,15 +23,15 @@ This EIP proposes a gas-based solution that allows contracts of any size while e
 
 ## Specification
 
-The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 and RFC 8174.
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC 2119](https://www.rfc-editor.org/rfc/rfc2119) and [RFC 8174](https://www.rfc-editor.org/rfc/rfc8174).
 
-1. Update the EIP-170 contract code size limit of 24KB (`0x6000` bytes) to 256KB (`0x20000` bytes).
+1. Update the [EIP-170](./eip-170.md) contract code size limit of 24KB (`0x6000` bytes) to 256KB (`0x20000` bytes).
 2. Change the gas schedule for opcodes which load code. Specifically, the `CALL`, `STATICCALL`, `DELEGATECALL`, `CALLCODE` and `EXTCODECOPY` opcodes are modified so that `ceil32(excess_contract_size) * 2 // 32` gas is added to the [cold access cost](https://github.com/ethereum/execution-specs/blob/1a587803e3e698407d204888b02342393f8b4fe5/src/ethereum/cancun/vm/instructions/system.py#L367), where `excess_contract_size = max(0, contract_size - 0x6000)`. (Cf. initcode metering: [EELS](https://github.com/ethereum/execution-specs/blob/1a587803e3e698407d204888b02342393f8b4fe5/src/ethereum/cancun/vm/gas.py#L269)). If the account is warm, no change to the gas schedule occurs.
 3. Update the EIP-3860 contract code size limit of 48KB (`0xc000` bytes) to 512KB (`0x40000` bytes).
 
 ## Rationale
 
-The gas cost of 2 per word was chosen in-line with EIP-3860. This accounts for:
+The gas cost of 2 per word was chosen in-line with [EIP-3860](./eip-3860.md). This accounts for:
 
 1. The additional disk I/O for retrieving larger contract code
 2. The increased computational resources for preprocessing larger code for execution (a.k.a. "JUMPDEST analysis").