Merge pull request ARMmbed#14393 from LDong-Arm/readme_post_build_update

Doc update: post build now supported on TF-M targets

Author: 0xc0170

tools/cmake/README.md

@@ -35,12 +35,9 @@ The following targets are supported:
 - STM targets
 - Toshiba targets
 
-The post build operations is only supported for the following Mbed boards:
+The post build operations are supported for the following Mbed boards:
 LPC1114, LPC1768, ARCH_PRO, LPC54114,
-LPC546XX, FF_LPC546XX, CY8CKIT064B0S2_4343W, CYTFM_064B0S2_4343W, CYSBSYSKIT_01.
-
-The following Mbed boards do not have post build operations support as TFM
-is not yet supported:
+LPC546XX, FF_LPC546XX, CY8CKIT064B0S2_4343W, CYTFM_064B0S2_4343W, CYSBSYSKIT_01,
 ARM_MUSCA_B1, ARM_MUSCA_S1.
 
 ### Supported toolchains