[Bug] Fix typos exercise all information endpoint

[wasswa-derick]

What does this PR do?

• Fixes a typo on exercise all information endpoint.

Description of Task to be completed?

• The endpoint title has a typo and this is replaced with a correct one.
• The breadcrumbs on the endpoint have a typo as well and this is corrected.

How should this be manually tested?

• Clone the project, https://github.com/andela/wg-wits.git.
• In your terminal, cd wg-wits
• Checkout to the bg-fix-exercises-endpoint-typo-159236197 branch.
• In the project directory, create a virtual environment and activate it: run virtualenv -p python3 venv-django then source venv-django/bin/activate
• Install requirements pip install -r requirements_devel.txt
• Serve the application python manage.py runserver
• In the browser, visit the endpoint for a particular exercise and show its information with, http://127.0.0.1:8000/api/v2/exercise/<exerciseID>/info/
• The exercise information endpoint and the breadcrumb should look like the ones in the image below.

What are the relevant pivotal tracker stories?

#159236197

Screenshots (if appropriate)

Title and breadcrumbs for the exercise information endpoint.

[coveralls]

Pull Request Test Coverage Report for Build 308

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.217%

---

Totals
Change from base Build 298:	0.0%
Covered Lines:	12300
Relevant Lines:	13195

---

💛 - Coveralls