Merge pull request #2471 from moj-analytical-services/docs/fix-backen…

…d-api-page

Fix docs examples

docs/topic_guides/splink_fundamentals/backends/backends.md

@@ -95,31 +95,31 @@ Once you have initialised the `linker` object, there is no difference in the sub
     ```python
     from splink import Linker, DuckDBAPI
 
-    linker = Linker(your_args. DuckDBAPI)
+    linker = Linker(df, settings, db_api=DuckDBAPI(...))
     ```
 
 === ":simple-apachespark: Spark"
 
     ```python
     from splink import Linker, SparkAPI
 
-    linker = Linker(your_args. SparkAPI)
+    linker = Linker(df, settings, db_api=SparkAPI(...))
     ```
 
 === ":simple-amazonaws: Athena"
 
     ```python
     from splink import Linker, AthenaAPI
 
-    linker = Linker(your_args. AthenaAPI)
+    linker = Linker(df, settings, db_api=AthenaAPI(...))
     ```
 
 === ":simple-sqlite: SQLite"
 
     ```python
     from splink import Linker, SQLiteAPI
 
-    linker = Linker(your_args. SQLiteAPI)
+    linker = Linker(df, settings, db_api=SQLiteAPI(...))
 
     ```
 
@@ -128,7 +128,7 @@ Once you have initialised the `linker` object, there is no difference in the sub
     ```python
     from splink import Linker, PostgresAPI
 
-    linker = Linker(your_args. PostgresAPI)
+    linker = Linker(df, settings, db_api=PostgresAPI(...))
 
     ```