Update ecc extension section in the book to match CurveConfig rewrite

Author: Avaneesh-axiom

book/src/custom-extensions/ecc.md

@@ -109,23 +109,21 @@ For the guest program to build successfully, all used moduli and curves must be
 
 ```toml
 [app_vm_config.modular]
-supported_modulus = ["115792089237316195423570985008687907853269984665640564039457584007908834671663", "115792089237316195423570985008687907852837564279074904382605163141518161494337"]
+supported_modulus = ["115792089237316195423570985008687907853269984665640564039457584007908834671663", "115792089237316195423570985008687907852837564279074904382605163141518161494337", "57896044618658097711785492504343953926634992332820282019728792003956564819949"]
 
-[[app_vm_config.ecc.supported_curves]]
+[[app_vm_config.ecc.supported_sw_curves]]
 modulus = "115792089237316195423570985008687907853269984665640564039457584007908834671663"
 scalar = "115792089237316195423570985008687907852837564279074904382605163141518161494337"
 
-[app_vm_config.ecc.supported_curves.coeffs]
-type = "SwCurve"
+[app_vm_config.ecc.supported_sw_curves.coeffs]
 a = "0"
 b = "7"
 
-[[app_vm_config.ecc.supported_curves]]
+[[app_vm_config.ecc.supported_te_curves]]
 modulus = "57896044618658097711785492504343953926634992332820282019728792003956564819949"
 scalar = "7237005577332262213973186563042994240857116359379907606001950938285454250989"
 
-[app_vm_config.ecc.supported_curves.coeffs]
-type = "TeCurve"
+[app_vm_config.ecc.supported_te_curves.coeffs]
 a = "57896044618658097711785492504343953926634992332820282019728792003956564819948"
 d = "37095705934669439343138083508754565189542113879843219016388785533085940283555"
 ```