Fix note, replace "Enterprise" with "Core"

[jstirnaman]

• https://docs.influxdata.com/influxdb3/enterprise/get-started/#writing-and-querying-for-multi-node-setups
  Problems:

  • Section seems out of place.
  • "If you’re running InfluxDB 3 Enterprise in a single-instance setup, writing and querying is the same as for InfluxDB 3 Core."

• https://docs.influxdata.com/influxdb3/enterprise/get-started/#specify-hosts-for-writes-and-queries
  Problems:

  • Broken grammar, punct.
  • Broken italics
  • Italics give the idea that write-only and read-only might be actual values