Update builders.py

Author: cxzhong

src/sage_docbuild/builders.py

@@ -1155,7 +1155,6 @@ def get_all_documents(source: Path) -> list[Path]:
 
     EXAMPLES::
 
-        sage: from pathlib import Path
         sage: from sage_docbuild.builders import get_all_documents
         sage: documents = get_all_documents(Path('src/doc'))
         sage: Path('en/tutorial') in documents
@@ -1189,7 +1188,6 @@ def get_all_reference_documents(source: Path) -> list[Path]:
 
     EXAMPLES::
 
-        sage: from pathlib import Path
         sage: from sage_docbuild.builders import get_all_reference_documents
         sage: documents = get_all_reference_documents(Path('src/doc/en'))
         sage: Path('reference/algebras') in documents