Support double-backticks as delimiters.

PiperOrigin-RevId: 526769264

Author: MarkDaoust

tools/tensorflow_docs/api_generator/reference_resolver.py

@@ -76,9 +76,10 @@ class ReferenceResolver:
   AUTO_REFERENCE_RE = re.compile(
       r"""
       (?P<brackets>\[.*?\])|                      # match a '[]' span
-      `(?P<backticks>@?[\w\(\[\)\]\{\}.,=\s]+?)`  # or a `` span
+      ``?(?P<backticks>@?[\w\(\[\)\]\{\}.,=\s]+?)``?  # or a `` span
       """,
-      flags=re.VERBOSE)
+      flags=re.VERBOSE,
+  )
 
   def __init__(
       self,

tools/tensorflow_docs/api_generator/reference_resolver_test.py

@@ -28,7 +28,6 @@
 from tensorflow_docs.api_generator import reference_resolver as reference_resolver_lib
 
 
-
 class TestReferenceResolver(absltest.TestCase):
   _BASE_DIR = tempfile.mkdtemp()
 
@@ -113,6 +112,7 @@ class TestPartialSymbolAutoRef(parameterized.TestCase):
       ('parens', 'Model.fit(x, y, epochs=5)', '../tf/keras/Model.md#fit'),
       ('duplicate_name', 'tf.matmul', '../tf/linalg/matmul.md'),
       ('full_name', 'tf.concat', '../tf/concat.md'),
+      ('extra_backticks', '`tf.concat`', '../tf/concat.md'),
       ('normal_and_compat', 'linalg.matmul', '../tf/linalg/matmul.md'),
       ('compat_only', 'math.deprecated', None),
       ('contrib_only', 'y.z', None),
@@ -146,7 +146,7 @@ def test_partial_symbol_references(self, string, link):
     if link is None:
       expected = input_string
     else:
-      expected = self.REF_TEMPLATE.format(link=link, text=string)
+      expected = self.REF_TEMPLATE.format(link=link, text=string.strip('`'))
 
     self.assertEqual(expected, ref_string)