Update e2store.md

docs/e2store.md

@@ -183,7 +183,7 @@ Each era is identified by when it ends. Thus, the genesis era is era `0`, follow
 
 `.era` file names follow a simple convention: `<config-name>-<era-number>-<era-count>-<short-historical-root>.era`:
 
-* `config-name` is the `CONFIG_NAME` field of the runtime configation (`mainnet`, `sepolia`, `holesky`, etc)
+* `config-name` is the `CONFIG_NAME` field of the runtime configuration (`mainnet`, `sepolia`, `holesky`, etc)
 * `era-number` is the number of the _first_ era stored in the file - for example, the genesis era file has number 0 - as a 5-digit 0-filled decimal integer
 * `short-era-root` is the first 4 bytes of the last historical root in the _last_ state in the era file, lower-case hex-encoded (8 characters), except the genesis era which instead uses the `genesis_validators_root` field from the genesis state.
   * The root is available as `state.historical_roots[era - 1]` except for genesis, which is `state.genesis_validators_root`