Update Functional Testing Types (#2526)

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/100-functional-testing/sanity-testing.md

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-# Sanity testing
+# Sanity Testing
+
+Sanity testing is a kind of Software Testing performed after receiving a software build, with minor changes in code, or functionality, to ascertain that the bugs have been fixed and no further issues are introduced due to these changes. The goal is to determine that the proposed functionality works roughly as expected. If sanity test fails, the build is rejected to save the time and costs involved in a more rigorous testing.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/sanity-testing-software-testing/'>Sanity Testing | Software Testing</BadgeLink>

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/100-functional-testing/smoke-testing.md

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-# Smoke testing
+# Smoke Testing
+
+Smoke Testing is a software testing process that determines whether the deployed software build is stable or not. Smoke testing is a confirmation for QA team to proceed with further software testing. It consists of a minimal set of tests run on each build to test software functionalities.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/smoke-testing.html'>What is Smoke Testing?
+</BadgeLink>

content/roadmaps/113-qa/content/100-qa-basics/107-testing-techniques/100-functional-testing/uat.md

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-# Uat
+# UAT
+
+User Acceptance Testing (UAT) is a type of testing performed by the end user or the client to verify/accept the software system before moving the software application to the production environment. UAT is done in the final phase of testing after functional, integration and system testing is done.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.guru99.com/user-acceptance-testing.html'>What is User Acceptance Testing (UAT)?</BadgeLink>