chore: delete example.tiff

Author: stevenhua0320

docs/examples/example.tiff

@@ -12,13 +12,13 @@
 load_image_param = [
     # case 1: just filename of file in current directory.
     # expect function loads tiff file from cwd
-    ("example.tiff", True),
+    ("KFe2As2-00838.tif", True),
     # case 2: absolute file path to file in another directory.
     # expect file is found and correctly read.
-    ("home_dir/example.tiff", True),
+    ("home_dir/KFe2As2-00838.tif", True),
     # case 3: relative file path to file in another directory.
     # expect file is found and correctly read
-    ("./example.tiff", True),
+    ("./KFe2As2-00838.tif", True),
     # case 4: non-existent file that incurred by mistype.
     ("nonexistent_file.tif", False),
 ]
@@ -31,9 +31,9 @@ def test_load_image(input_path, expected, user_filesystem):
     os.chdir(cwd_dir)
 
     # locate source example file inside project docs
-    source_file = PROJECT_ROOT / "docs" / "examples" / "example.tiff"
-    shutil.copy(source_file, cwd_dir / "example.tiff")
-    shutil.copy(source_file, home_dir / "example.tiff")
+    source_file = PROJECT_ROOT / "docs" / "examples" / "KFe2As2-00838.tif"
+    shutil.copy(source_file, cwd_dir / "KFe2As2-00838.tif")
+    shutil.copy(source_file, home_dir / "KFe2As2-00838.tif")
 
     old_cwd = Path.cwd()
     os.chdir(home_dir)