Update Docusaurus to latest (#290)

Co-authored-by: kazk <kazk@users.noreply.github.com>

Author: kazk

content/training/troubleshooting.mdx

@@ -1,6 +1,5 @@
 ---
 title: Troubleshooting Your Solution
-description: ""
 kind: recipe
 ---
 
@@ -65,7 +64,7 @@ Most, if not all, languages on Codewars support writing to standard output (stdo
 <!--- For false positive "built in" -->
 <!--- textlint-disable terminology -->
 
-**Important note:** remember that when tests are run, your solution is executed *first* (potentially with all the print statements inside), then assertions are performed on the returned value, and finally, green/red assertion messages are printed. This leads to the fact that whatever you print in your solution will appear **above** the assertion message it applies to. It's somewhat difficult to spot it visually in the Codewars test output panel. If you think that your output totally does not match the test case or its assertion message, be sure to look at the green/red message located **below** whatever you printed, and not above it. Additionally, some test suites are built in a way that the printed output and related assertion messages are separated visually from one from another, but such kata are rather exceptions and not that common.
+**Important note:** remember that when tests are run, your solution is executed _first_ (potentially with all the print statements inside), then assertions are performed on the returned value, and finally, green/red assertion messages are printed. This leads to the fact that whatever you print in your solution will appear **above** the assertion message it applies to. It's somewhat difficult to spot it visually in the Codewars test output panel. If you think that your output totally does not match the test case or its assertion message, be sure to look at the green/red message located **below** whatever you printed, and not above it. Additionally, some test suites are built in a way that the printed output and related assertion messages are separated visually from one from another, but such kata are rather exceptions and not that common.
 
 <!--- textlint-enable terminology -->
 

package.json

@@ -16,8 +16,8 @@
     "write-heading-ids": "docusaurus write-heading-ids"
   },
   "dependencies": {
-    "@docusaurus/core": "2.0.0-alpha.72",
-    "@docusaurus/preset-classic": "2.0.0-alpha.72",
+    "@docusaurus/core": "2.0.0-alpha.73",
+    "@docusaurus/preset-classic": "2.0.0-alpha.73",
     "@mdx-js/react": "^1.6.21",
     "clsx": "^1.1.1",
     "react": "^17.0.1",