Connector doc formatting and link fixes

In reviewing the build for the Q1 downstream doc, I discovered a few minor errors that need fixing. These are mostly repeated instances of the same error.

• Anchor IDs that are omitted from some links work ok upstream, but downstream, they result in a generic link to the top-level of the User Guide.
• For each connector, the introductory Deployment section that's conditionalized for downstream use, includes a bullet in which a list continuation character (+) is placed on separate line, resulting in excess space between the bullet item and the following text. Replace the newline with a space, so that the character is appended to the line for the bullet item.

To expedite corrections to the Q1 release doc, a separate downstream-only fix that fixes most of the errors is already applied to the relevant files.

The following edits are needed in the upstream files:

• architecture.adoc
  • L33: link to topic routing missing anchor ID: #topic-routing
  • L39: Link to new record state extraction missing anchor ID #new-record-state-extraction

• db2.adoc
  • L880: Anchor omitted in links to Avro converter and serialization docs: #avro-serialization
  • L895: Anchor omitted in links to Avro serialization docs: #avro-serialization
  • L1628: List continuation
  • L1851: Anchor omitted in links to Avro converter and serialization docs: #avro-serialization

• mongodb.adoc
  • L739: Anchor omitted in links to Avro converter and serialization docs: #avro-serialization
  • L1073: List continuation

• mysql.adoc
  • L1080 Anchor omitted in links to Avro converter and serialization docs: #avro-serialization
  • L1095 Anchor omitted in links to Avro converter and serialization docs: #avro-serialization
  • L2014 List continuation
  • L2798 Anchor omitted in links to Avro serialization doc: #avro-serialization

• oracle.adoc
  • L902 Link to Avro Converter targets /docs/faq. Replace with attribute that links to docs/configuration/avro/? Also typo: schems ==> schema.
  • L912 Link to Avro doc targets /docs/faq. Replace with attribute that links to docs/configuration/avro/? Per comment from ccranfor@redhat.com, define link target via attribute.
  • L1496 L1773 List continuation

• postgresql.adoc
  • L887 Anchor omitted in links to Avro serialization doc: #avro-serialization
  • L902 Anchor omitted in links to Avro serialization doc: #avro-serialization
  • L2298 list continuation

• sqlserver.adoc
  • L805 Anchor omitted in links to Avro serialization doc: #avro-serialization
  • L820 Anchor omitted in links to Avro serialization doc: #avro-serialization
  • L1704 List continuation
  • L1897 ADD link to Avro (link:{link-avro-serialization}#avro-serialization)
  • L1962 ADD link to Avro
  • L2367 Line that includes xref to Avro doc is conditionalized as community content. Remove conditional?

• partials/modules/all-connectors/proc-using-streams-to-deploy-a-debezium-connector.adoc
  • L178 Anchor omitted in links to Avro serialization doc: #avro-serialization Fixed in DBZ-4700.