fix doctest errors

Author: cxzhong

src/sage_docbuild/builders.py

@@ -1155,8 +1155,9 @@ 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: documents = get_all_documents(Path('sage/src/doc'))
         sage: Path('en/tutorial') in documents
         True
     """
@@ -1188,8 +1189,9 @@ 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: documents = get_all_reference_documents(Path('sage/src/doc/en'))
         sage: Path('reference/algebras') in documents
         True
     """