Update RELEASE_NOTES.md

Author: kristopk

RELEASE_NOTES.md

@@ -43,9 +43,9 @@
     * [Improved messaging for AFI builder script](https://github.com/aws/aws-fpga/pull/407)
     * [Fixes address decoding to DDR slaves in cl_dram_dma example](hdk/cl/examples/cl_dram_dma/design)  
   * Improvements
-    * [Improves SDK FPGA managment tools error messaging](sdk/userspace/fpga_mgmt_tools/README.md)
+    * [Improves SDK FPGA management tools error messaging](sdk/userspace/fpga_mgmt_tools/README.md)
     * [Enhanced DMA lib for general device number mapping](sdk/userspace/fpga_libs/fpga_dma/fpga_dma_utils.c)
-    * [Improved guidelines for AFI power managment](hdk/docs/afi_power.md)
+    * [Improved guidelines for AFI power management](hdk/docs/afi_power.md)
     * [Improved Streaming Data Engine IP Integration Documentation](sdk/apps/virtual-ethernet/doc/SDE_HW_Guide.md) 
 
   * Package versions used to validate SDAccel runtime