Sync latest content added to Infura

[joaniefromtheblock]

Add latest content to INFURA docs to MM docs (merged PRs since May 30):

• [ ] https://github.com/INFURA/docs/pull/244
• [ ] https://github.com/INFURA/docs/pull/246
• [x] https://github.com/INFURA/docs/pull/248
• [ ] https://github.com/INFURA/docs/pull/249
• [ ] https://github.com/INFURA/docs/pull/250
• [ ] https://github.com/INFURA/docs/pull/251/
• [ ] https://github.com/INFURA/docs/pull/252
• [ ] https://github.com/INFURA/docs/pull/258
• [x] https://github.com/INFURA/docs/pull/261
• [x] https://github.com/INFURA/docs/pull/263