docs: fix docstrings to improve html rendering of code examples (#1788)

* docs: fix docstrings to improve html rendering of code examples

* fix examples docstring in one more file

Author: shobsi

third_party/bigframes_vendored/pandas/core/computation/eval.py

@@ -171,6 +171,7 @@ def eval(
     with plain ol' Python evaluation.
 
     **Examples:**
+
         >>> import bigframes.pandas as bpd
         >>> bpd.options.display.progress_bar = None
 

third_party/bigframes_vendored/pandas/core/frame.py

@@ -4253,6 +4253,7 @@ def corrwith(
         correlations.
 
         **Examples:**
+
             >>> import bigframes.pandas as bpd
             >>> bpd.options.display.progress_bar = None
 

third_party/bigframes_vendored/pandas/core/indexes/accessor.py

@@ -204,6 +204,7 @@ def isocalendar(self):
         Calculate year, week, and day according to the ISO 8601 standard.
 
         **Examples:**
+
             >>> import pandas as pd
             >>> import bigframes.pandas as bpd
             >>> bpd.options.display.progress_bar = None

third_party/bigframes_vendored/pandas/io/gbq.py

@@ -67,6 +67,7 @@ def read_gbq(
             >>> df = bpd.read_gbq("bigquery-public-data.ml_datasets.penguins")
 
         Read table path with wildcard suffix and filters:
+
             >>> df = bpd.read_gbq_table("bigquery-public-data.noaa_gsod.gsod19*", filters=[("_table_suffix", ">=", "30"), ("_table_suffix", "<=", "39")])
 
         Preserve ordering in a query input.