Fix typo

This typo fix should also trigger pot generation.

Signed-off-by: Carmen Bianca BAKKER <[email protected]>

src/reuse/cli/common.py

@@ -106,7 +106,7 @@ def handle_parse_result(
 
 
 def spdx_identifier(text: str) -> Expression:
-    """factory for creating SPDX expressions."""
+    """Factory for creating SPDX expressions."""
     try:
         return _LICENSING.parse(text)
     except (ExpressionError, ParseError) as error: