fix: replace h tags (#40750)

Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/understanding-case-sensitivity-in-variables.md

@@ -13,7 +13,7 @@ In JavaScript all variables and function names are case sensitive. This means th
 
 `MYVAR` is not the same as `MyVar` nor `myvar`. It is possible to have multiple distinct variables with the same name but different casing. It is strongly recommended that for the sake of clarity, you *do not* use this language feature.
 
-<h4>Best Practice</h4>
+**Best Practice**
 
 Write variable names in JavaScript in <dfn>camelCase</dfn>. In <dfn>camelCase</dfn>, multi-word variable names have the first word in lowercase and the first letter of each subsequent word is capitalized.
 

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/chain-search-query-helpers-to-narrow-search-results.md

@@ -14,15 +14,6 @@ If you don’t pass the callback as the last argument to `Model.find()` (or to t
 
 Modify the `queryChain` function to find people who like the food specified by the variable named `foodToSearch`. Sort them by `name`, limit the results to two documents, and hide their age. Chain `.find()`, `.sort()`, `.limit()`, `.select()`, and then `.exec()`. Pass the `done(err, data)` callback to `exec()`.
 
-## Further Reading
-
-If you are eager to learn and want to go deeper, You may look at:
-
--   Indexes ( very important for query efficiency ),
--   Pre/Post hooks,
--   Validation,
--   Schema Virtuals and Model, Static, and Instance methods,
-
 # --hints--
 
 Chaining query helpers should succeed

curriculum/challenges/english/09-information-security/information-security-with-helmetjs/configure-helmet-using-the-parent-helmet-middleware.md

@@ -12,7 +12,7 @@ As a reminder, this project is being built upon the following starter project on
 
 `app.use(helmet())` will automatically include all the middleware introduced above, except `noCache()`, and `contentSecurityPolicy()`, but these can be enabled if necessary. You can also disable or configure any other middleware individually, using a configuration object.
 
-<h3>Example:</h3>
+**Example:**
 
 ```js
 app.use(helmet({

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/24-game.md

@@ -16,7 +16,7 @@ The aim of the game is to arrange four numbers in a way that when evaluated, the
 
 Implement a function that takes a string of four digits as its argument, with each digit from 1 to 9 (inclusive) with repetitions allowed, and returns an arithmetic expression that evaluates to the number 24. If no such solution exists, return "no solution exists".
 
-<h4><strong>Rules:</strong></h4>
+**Rules:**
 <ul>
   <li> Only the following operators/functions are allowed: multiplication, division, addition, subtraction. </li>
   <li> Division should use floating point or rational arithmetic, etc, to preserve remainders. </li>

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/balanced-brackets.md

@@ -10,8 +10,7 @@ dashedName: balanced-brackets
 
 Determine whether a generated string of brackets is balanced; that is, whether it consists entirely of pairs of opening/closing brackets (in that order), none of which mis-nest.
 
-<h4><strong>Examples:</strong></h4>
+**Examples:**
-
 | Input                     | Output |
 | ------------------------- | ------ |
 | <code>\[]</code>          | true   |

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/hash-join.md

@@ -41,7 +41,7 @@ In pseudo-code, the algorithm could be expressed as follows:
 
 Implement the "hash join" algorithm as a function and demonstrate that it passes the test-case listed below. The function should accept two arrays of objects and return an array of combined objects.
 
-<h4><strong>Input</strong></h4>
+**Input**
 
 <table>
   <tr>
@@ -127,7 +127,7 @@ Implement the "hash join" algorithm as a function and demonstrate that it passes
   </tr>
 </table>
 
-<h4><strong>Output</strong></h4>
+**Output**
 
 | A_age | A_name | B_character | B_nemesis |
 | ----- | ------ | ----------- | --------- |

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/zhang-suen-thinning-algorithm.md

@@ -70,7 +70,7 @@ Obviously the boundary pixels of the image cannot have the full eight neighbours
   <li>Define $B(P1)$ = the number of black pixel neighbours of P1. ( = sum(P2 .. P9) )</li>
 </ul>
 
-<h3>Step 1:</h3>
+**Step 1:**
 
 All pixels are tested and pixels satisfying all the following conditions (simultaneously) are just noted at this stage.
 
@@ -84,7 +84,7 @@ All pixels are tested and pixels satisfying all the following conditions (simult
 
 After iterating over the image and collecting all the pixels satisfying all step 1 conditions, all these condition satisfying pixels are set to white.
 
-<h3>Step 2:</h3>
+**Step 2:**
 
 All pixels are again tested and pixels satisfying all the following conditions are just noted at this stage.
 
@@ -98,7 +98,7 @@ All pixels are again tested and pixels satisfying all the following conditions a
   
 After iterating over the image and collecting all the pixels satisfying all step 2 conditions, all these condition satisfying pixels are again set to white.
 
-<h3>Iteration:</h3>
+**Iteration:**
 
 If any pixels were set in this round of either step 1 or step 2 then all steps are repeated until no image pixels are so changed.