[AIRFLOW-2312] Docs Typo Correction: Corresponding

# JIRA
[x] My PR addresses the following Airflow JIRA
issues and references them in the PR title.
*
https://issues.apache.org/jira/browse/AIRFLOW-2312

# Description

[x] Here are some details about my PR

Minor typo fix in the docs. `correpsonding` to
`corresponding`

# Tests
[x] My PR adds the following unit tests OR does
not need testing for this extremely good reason:

I assume I don't need testing for docs

# Commits

[x] My commits all reference JIRA issues in their
subject lines, and I have squashed multiple
commits if they address the same issue. In
addition, my commits follow the guidelines from
"How to write a good git commit message":

1. Subject is separated from body by a blank line
2. Subject is limited to 50 characters
3. Subject does not end with a period
4. Subject uses the imperative mood ("add", not
"adding")
5. Body wraps at 72 characters
6. Body explains "what" and "why", not "how"

Closes apache#3211 from tamsanh/patch-1

docs/concepts.rst

@@ -380,7 +380,7 @@ opposed to XComs that are pushed manually).
 
 If ``xcom_pull`` is passed a single string for ``task_ids``, then the most
 recent XCom value from that task is returned; if a list of ``task_ids`` is
-passed, then a correpsonding list of XCom values is returned.
+passed, then a corresponding list of XCom values is returned.
 
 .. code:: python