DOCSP-38451 Add Timescale DB Footnote to Supported Databases (#115)

* DOCSP-38451 Add Timescale DB Footnote to Supported Databases

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Author: ianf-mongodb

source/getting-started/supported-databases.txt

@@ -47,7 +47,7 @@ Relational Migrator supports the following source databases:
        versions before 2016)
      - Self hosted, AWS RDS, Azure SQL Database
 
-   * - PostgreSQL
+   * - PostgreSQL [1]_
      - 10 and higher
      - Self hosted, AWS RDS/Aurora, Azure Database
 
@@ -59,6 +59,8 @@ Relational Migrator supports the following source databases:
      - 15 and higher (Sybase IQ not supported)
      - Self hosted
 
+.. [1] `TimescaleDB hypertables <https://docs.timescale.com/use-timescale/latest/hypertables/>`__ are supported for PostgreSQL. 
+
 MongoDB Databases and Versions
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