[DOCS] Minor Edits to Connect GX Cloud to PostgreSQL (GX Cloud)

[kwcanuck]

In this Slack conversation, @joshzzheng identified an issue with the connection string example provided in step 6 of Connect to a PostgreSQL Data Asset. This PR implements the necessary edit.

Definition of done

• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Appropriate tests and docs have been updated

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.29%. Comparing base (9c9d551) to head (7327a2b).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9927      +/-   ##
===========================================
- Coverage    77.33%   77.29%   -0.04%     
===========================================
  Files          490      490              
  Lines        41659    41659              
===========================================
- Hits         32218    32202      -16     
- Misses        9441     9457      +16     

Flag	Coverage Δ
3.10	63.57% <ø> (ø)
3.10 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.10 aws_deps	?
3.10 big	?
3.10 databricks	?
3.10 filesystem	?
3.10 mssql	?
3.10 mysql	?
3.10 postgresql	?
3.10 snowflake	?
3.10 spark	?
3.10 trino	?
3.11	63.57% <ø> (ø)
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.68% <ø> (ø)
3.11 aws_deps	44.71% <ø> (ø)
3.11 big	54.26% <ø> (ø)
3.11 databricks	45.90% <ø> (ø)
3.11 filesystem	59.06% <ø> (ø)
3.11 mssql	48.78% <ø> (ø)
3.11 mysql	48.83% <ø> (ø)
3.11 postgresql	52.71% <ø> (ø)
3.11 snowflake	?
3.11 spark	56.32% <ø> (ø)
3.11 trino	50.77% <ø> (ø)
3.8	63.59% <ø> (ø)
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.69% <ø> (ø)
3.8 aws_deps	44.73% <ø> (ø)
3.8 big	54.27% <ø> (ø)
3.8 databricks	45.92% <ø> (ø)
3.8 filesystem	59.07% <ø> (ø)
3.8 mssql	48.76% <ø> (ø)
3.8 mysql	48.82% <ø> (ø)
3.8 postgresql	52.70% <ø> (ø)
3.8 snowflake	?
3.8 spark	56.28% <ø> (ø)
3.8 trino	50.75% <ø> (ø)
3.9	63.59% <ø> (ø)
3.9 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.9 aws_deps	?
3.9 big	?
3.9 databricks	?
3.9 filesystem	?
3.9 mssql	?
3.9 mysql	?
3.9 postgresql	?
3.9 snowflake	?
3.9 spark	?
3.9 trino	?
cloud	0.00% <ø> (ø)
docs-basic	47.43% <ø> (ø)
docs-creds-needed	48.50% <ø> (ø)
docs-spark	47.16% <ø> (ø)

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[Rachel-Reverie]

LGTM