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: taskmaster-1
 pretty_name: Taskmaster-1
 ---
 
-# Dataset Card Creation Guide
+# Dataset Card for Taskmaster-1
 
 ## Table of Contents
 - [Dataset Description](#dataset-description)
@@ -181,17 +181,17 @@ Each annotation has a single field:
 
 The data in `one_person_dialogs` config is split into `train`, `dev` and `test` splits.
 
-|                            | Tain   | Valid | Test  |
-| -----                      | ------ | ----- | ----- |
-| N. Instances               | 6168   | 770   | 770   |
+|              |  train |  validation |  test |
+|--------------|-------:|------------:|------:|
+| N. Instances |   6168 |         770 |   770 |
 
 - woz_dialogs
 
 The data in `woz_dialogs` config has no default splits.
 
-|                            | Tain   |
-| -----                      | ------ |
-| N. Instances               | 5507   |
+|              |  train |
+|--------------|-------:|
+| N. Instances |   5507 |
 
 
 ## Dataset Creation