Update Load/Performance/Stress Testing Links and Formatting (#2090)

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/101-non-functional-testing/performance-testing.md

@@ -1,8 +1,8 @@
 # Performance Testing
 
-Performance Testing is a subset of Performance Engineering. It is a process of evaluating a system’s behavior under various extreme conditions. The main intent of performance testing is monitoring and improving key performance indicators such as response time, throughput, memory, CPU utilization and more.
+Performance Testing is a subset of Performance Engineering. It is a process of evaluating a system’s behavior under various extreme conditions. The main intent of performance testing is monitoring and improving key performance indicators such as response time, throughput, memory, CPU utilization, and more.
 
-There are three objectives (three S) of Performance testing to observe and evaluate: `Speed`, `Scalability` and `Stability`.
+There are three objectives (three S) of Performance testing to observe and evaluate: `Speed`, `Scalability`, and `Stability`.
 
 ## Types of Performance Testing
 
@@ -15,3 +15,6 @@ Following are the commonly used performance testing types, but not limited to:
 - Volume Testing
 - Scalability Testing
 - Capacity Testing
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/performance-testing.html'>Performance Testing Tutorial – Types (Example)</BadgeLink>

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/101-non-functional-testing/stress-testing.md

@@ -2,4 +2,7 @@
 
 `Stress Testing` is a type of `Performance Testing`. The objective of stress testing is to identify the breaking point of application under test under extreme normal load.
 
-e.g. injecting high volume of requests per second to an API might cause the disruption to its service or throws HTTP 503 Service Unavailable or cause other consequences.
+e.g. Injecting high volume of requests per second to an API might cause the disruption to its service, or throws HTTP 503 Service Unavailable or cause other consequences.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/stress-testing-tutorial.html'>What is Stress Testing in Software Testing?</BadgeLink>