doc: minor updates

[leovct]

A few minor updates to README.md and to script/utils/extract.js.

Before the fix.

root@workload:/app/pol-token# node script/utils/extract.js 1 '1.1.0' 'Deploy.s.sol'
/app/pol-token/script/utils/extract.js:99
          throw new Error(
                ^

Error: Implementation for PolygonMigration(0x29e7DF7b6A1B2b07b731457f499E1696c60E2C4e) did not change - 0x550B7CDaC6F5a0d9e840505c3Df74aC045530446, deployed - 0x0E695f36ADe2A12ABEa51622e80F105e125d1d6e
    at main (/app/pol-token/script/utils/extract.js:99:17)
    at Object.<anonymous> (/app/pol-token/script/utils/extract.js:501:1)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:22:47
root@workload:/app/pol-token# node script/utils/extract.js 1 '1.1.0' 'Deploy.s.sol'
/app/pol-token/script/utils/extract.js:99
          throw new Error(
                ^

Error: Implementation for PolygonMigration(0x29e7DF7b6A1B2b07b731457f499E1696c60E2C4e) did not change - 0x550B7CDaC6F5a0d9e840505c3Df74aC045530446, deployed - 0x0E695f36ADe2A12ABEa51622e80F105e125d1d6e
    at main (/app/pol-token/script/utils/extract.js:99:17)
    at Object.<anonymous> (/app/pol-token/script/utils/extract.js:501:1)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:22:47

After the fix.

root@workload:/app/pol-token# node script/utils/extract.js 1 '1.1.0' 'Deploy.s.sol'
Error: Implementation for PolygonMigration(0x29e7DF7b6A1B2b07b731457f499E1696c60E2C4e) did not change - 0x550B7CDaC6F5a0d9e840505c3Df74aC045530446, deployed - 0x0E695f36ADe2A12ABEa51622e80F105e125d1d6e
    at main (/app/pol-token/script/utils/extract.js:100:19)
    at Object.<anonymous> (/app/pol-token/script/utils/extract.js:506:1)
    at Module._compile (node:internal/modules/cjs/loader:1198:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1252:10)
    at Module.load (node:internal/modules/cjs/loader:1076:32)
    at Function.Module._load (node:internal/modules/cjs/loader:911:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:22:47

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