Replace San Marino by Samoan

Closes https://huggingface.co/datasets/mc4/discussions/1

README.md

@@ -272,7 +272,7 @@ Note that the languages that end with "-Latn" are simply romanized variants, i.e
 | si              | Sinhala              |
 | sk              | Slovak               |
 | sl              | Slovenian            |
-| sm              | San Marino           |
+| sm              | Samoan           |
 | sn              | Shona                |
 | so              | Somali               |
 | sq              | Albanian             |