Fix typo in train split name (#3751)

* Fix typo in README guide

* Fix split naming and table alignment in README guide

* Fix split naming and table alignment in all datasets

* Fix previously malformed dataset cards

* Fix previously malformed dataset cards

Commit from https://github.com/huggingface/datasets/commit/af6e54febe3b822118dfed28ddb797d8350e5d27

README.md

@@ -21,7 +21,7 @@ paperswithcode_id: hybridqa
 pretty_name: HybridQA
 ---
 
-# Dataset Card Creation Guide
+# Dataset Card for HybridQA
 
 ## Table of Contents
 - [Dataset Description](#dataset-description)
@@ -119,15 +119,32 @@ A typical example looks like this
 
 ### Data Fields
 
-[More Information Needed]
+- `question_id` (str)
+- `question` (str)
+- `table_id` (str)
+- `answer_text` (str)
+- `question_postag` (str)
+- `table` (dict):
+  - `url` (str)
+  - `title` (str)
+  - `header` (list of str)
+  - `data` (list of dict):
+    - `value` (str)
+    - `urls` (list of dict):
+      - `url` (str)
+      - `summary` (str)
+- `section_title` (str)
+- `section_text` (str)
+- `uid` (str)
+- `intro` (str)
 
 ### Data Splits
 
 The dataset is split into `train`, `dev` and `test` splits.
 
-|                 | Tain   | Valid | Test  |
-| --------------- | ------ | ----- | ----- |
-| N. Instances    | 62682  | 3466  | 3463  |
+|                 | train | validation | test |
+| --------------- |------:|-----------:|-----:|
+| N. Instances    | 62682 |       3466 | 3463 |
 
 
 ## Dataset Creation