[docs] remove outdated build instructions from CLI docs (#6615)

src/cli/README_COAP.md

@@ -4,15 +4,6 @@ The OpenThread CoAP APIs may be invoked via the OpenThread CLI.
 
 ## Quick Start
 
-### Build with CoAP API support
-
-Use the `COAP=1` build switch to enable CoAP API support.
-
-```bash
-> ./bootstrap
-> make -f examples/Makefile-simulation COAP=1
-```
-
 ### Form Network
 
 Form a network with at least two devices.

src/cli/README_COAPS.md

@@ -4,15 +4,6 @@ The OpenThread CoAPS APIs may be invoked via the OpenThread CLI.
 
 ## Quick Start
 
-### Build with CoAPS API support
-
-Use the `COAPS=1` build switch to enable CoAPS API support.
-
-```bash
-> ./bootstrap
-> make -f examples/Makefile-simulation COAPS=1
-```
-
 ### Form Network
 
 Form a network with at least two devices.

src/cli/README_COMMISSIONING.md

@@ -2,24 +2,6 @@
 
 ## Quick Start
 
-### Build with Joiner support
-
-Use the `JOINER=1` build switch to enable Joiner support.
-
-```bash
-> ./bootstrap
-> make -f examples/Makefile-simulation JOINER=1
-```
-
-### Build with Commissioner support
-
-Use the `COMMISSIONER=1` build switch to enable Commissioner support.
-
-```bash
-> ./bootstrap
-> make -f examples/Makefile-simulation COMMISSIONER=1
-```
-
 ### Form Network
 
 Form a network with the device that has Commissioner support.

src/cli/README_SRP.md

@@ -2,19 +2,6 @@
 
 ## Quick Start
 
-### Build with SRP Server & Client support
-
-Use the `SRP_SERVER=1 SERVICE=1 ECDSA=1` build switches to enable SRP Server API support, and the `SRP_CLIENT=1 ECDSA=1` build switches for SRP Client API support.
-
-Make simulation SRP Server & Client:
-
-```bash
-./bootstrap
-make -f examples/Makefile-simulation SRP_SERVER=1 SRP_CLIENT=1 SERVICE=1 ECDSA=1
-```
-
-## Simulation Example
-
 ### Start SRP Server
 
 Start the SRP Server node: