Update README.md

Author: abhidixi11

README.md

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 ## FreeRTOS+POSIX: Portable Operating System Interface (POSIX threading wrapper) for FreeRTOS
 
-The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. FreeRTOS+POSIX implements *a small subset* of the [POSIX threading](https://pubs.opengroup.org/onlinepubs/7908799/xsh/threads.html) API. This subset allows application developers familiar with POSIX API to develop a FreeRTOS application using POSIX like threading premitives. FreeRTOS+POSIX does not implement more than 80% of the POSIX API. Therefore, an exiting POSIX compliant application or a POSIX compliant library cannot be ported to run on FreeRTOS Kernel using this wrapper. 
+The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. FreeRTOS+POSIX implements *a small subset* of the [POSIX threading](https://pubs.opengroup.org/onlinepubs/7908799/xsh/threads.html) API. This subset allows application developers familiar with POSIX API to develop a FreeRTOS application using POSIX like threading primitives. FreeRTOS+POSIX does not implement more than 80% of the POSIX API. Therefore, an existing POSIX compliant application or a POSIX compliant library cannot be ported to run on FreeRTOS Kernel using only this wrapper. 
 
 
 This repository only contains source code. For demo applications, please visit https://github.com/FreeRTOS/FreeRTOS-Labs.