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Fix a typo, change an em dash to a semi-comma

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@ -23,8 +23,8 @@ Created: 2015-11-15
If `block.number >= HOMESTEAD_FORK_BLKNUM`, do the following:
1. The gas cost *for creating contracts via a transaction* is increased from 21,000 to 53,000, i.e. if you send a transaction and the to address is the empty string, the initial gas subtracted is 53,000 plus the gas cost of the tx data, rather than 2,1000 as is currently the case. Contract creation from a contract using the `CREATE` opcode is unaffected.
2. All transaction signatures whose s-value is greater than `secp256k1n/2` are now considered invalid. The ECDSA recover precompiled contract remains unchanged and will keep accepting high s-values—this is useful e.g. if a contract recovers old Bitcoin signatures.
1. The gas cost *for creating contracts via a transaction* is increased from 21,000 to 53,000, i.e. if you send a transaction and the to address is the empty string, the initial gas subtracted is 53,000 plus the gas cost of the tx data, rather than 21,000 as is currently the case. Contract creation from a contract using the `CREATE` opcode is unaffected.
2. All transaction signatures whose s-value is greater than `secp256k1n/2` are now considered invalid. The ECDSA recover precompiled contract remains unchanged and will keep accepting high s-values; this is useful e.g. if a contract recovers old Bitcoin signatures.
3. If contract creation does not have enough gas to pay for the final gas fee for adding the contract code to the state, the contract creation fails (i.e. goes out-of-gas) rather than leaving an empty contract.
4. Change the difficulty adjustment algorithm from the current formula: `block_diff = parent_diff + parent_diff // 2048 * (1 if block_timestamp - parent_timestamp < 13 else -1) + int(2**((block.number // 100000) - 2))` (where the ` + int(2**((block.number // 100000) - 2))` represents the exponential difficulty adjustment component) to `block_diff = parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99) + int(2**((block.number // 100000) - 2))`, where `//` is the integer division operator, eg. `6 // 2 = 3`, `7 // 2 = 3`, `8 // 2 = 4`. The `minDifficulty` still defines the minimum difficulty allowed and no adjustment may take it below this.