Fix trivial spelling mistakes in workbook files, as discovered by vale.

Author: spier

.github/vale/Vocab/Base/accept.txt

@@ -10,3 +10,4 @@ asciidoctor
 asciidoc
 Yonik
 reviewdog
+duplicative

workbook/04-contributor.asciidoc

@@ -74,7 +74,7 @@ You should plan to be available at a minimum to fulfill a https://patterns.inner
 ===== Question 2.  Which of the following attitudes helps a contributor build a positive relationship with the community?
 
 . The solution owners and reviewers depend on contributions, so I help the project by posting a code change (such as a fix to a bug I have discovered or new feature I need) right away. The code review will then shake out any issues.
-. I am confident that my contribution will not be rejected, as this would constitute hostile behaviour towards contributors.
+. I am confident that my contribution will not be rejected, as this would constitute hostile behavior towards contributors.
 . I stay engaged and available for the project to support my changes and help drive the project forward.
 . I work only with people I am accustomed to working with, as this makes collaboration more efficient.
 
@@ -102,7 +102,7 @@ More than one answer may be correct in some questions.
 
 ====== Correct answer: 2 and 4
 
-Why 1 is incorrect: For many reasons, contributions to an open and shared solution will likely take more time than changes to a closed, single-team project. For example, coordination with the host may not be straightforward as it is with your immediate team. Your interests and the hosts’ interests may not easily align, and compromises may need to be found. Logistics may also add overhead, such as simply working in different timezones. To mitigate against these delays, plan with additional time. This will alleviate stress and tension and increase your chances of a successful engagement.
+Why 1 is incorrect: For many reasons, contributions to an open and shared solution will likely take more time than changes to a closed, single-team project. For example, coordination with the host may not be straightforward as it is with your immediate team. Your interests and the hosts’ interests may not easily align, and compromises may need to be found. Logistics may also add overhead, such as simply working in different time zones. To mitigate against these delays, plan with additional time. This will alleviate stress and tension and increase your chances of a successful engagement.
 
 Why 2 is correct: Through communication, you allow everyone to understand your intent and give advice where needed. Communication ensures that you understand the plans and goals of others and can work together optimally for the greatest impact.
 

workbook/index.md

@@ -1,4 +1,4 @@
 ---
 title: Learning Path - Workbook
 ---
-This workbook contains a short questionaire to asses your understanding of this learning path.
+This workbook contains a short questionnaire to asses your understanding of this learning path.