docs: update graduate count in README.md to match the number freeCodeCamp homepage (freeCodeCamp#61412)

Author: calvintaw

README.md

@@ -8,7 +8,7 @@
 
 ## freeCodeCamp.org's open-source codebase and curriculum
 
-[freeCodeCamp.org](https://www.freecodecamp.org) is a friendly community where you can learn to code for free. It is run by a [donor-supported 501(c)(3) charity](https://www.freecodecamp.org/donate) to help millions of busy adults transition into tech. Our community has already helped more than 40,000 people get their first developer job.
+[freeCodeCamp.org](https://www.freecodecamp.org) is a friendly community where you can learn to code for free. It is run by a [donor-supported 501(c)(3) charity](https://www.freecodecamp.org/donate) to help millions of busy adults transition into tech. Our community has already helped more than 100,000 people get their first developer job.
 
 Our full-stack web development and machine learning curriculum is completely free and self-paced. We have thousands of interactive coding challenges to help you expand your skills.