SMR-2587: Update flow rate parameters in documentation

[ermyas]

This PR updates the flow rate parameter values in the README to align with recent changes. These changes were made as part of SMR-2572. This PR addresses SMR-2587.

[platform-sa]

📃CI Report

Compiling 156 files with 0.8.19
Solc 0.8.19 finished in 14.87s
Compiler run �[33msuccessful with warnings:�[0m
�[1;33mWarning (9302)�[0m�[1;37m: Return value of low-level calls not used.�[0m
�[34m |�[0m
�[34m361 |�[0m �[33muser.call{value: amount}("")�[0m;
�[34m |�[0m �[1;33m^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m

�[1;33mWarning (9302)�[0m�[1;37m: Return value of low-level calls not used.�[0m
�[34m |�[0m
�[34m174 |�[0m �[33muser.call{value: amount}("")�[0m;
�[34m |�[0m �[1;33m^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m

Analysing contracts...
Running tests...

File	% Lines	% Statements	% Branches	% Funcs
src/child/ChildAxelarBridgeAdaptor.sol	100.00% (51/51)	100.00% (68/68)	100.00% (24/24)	100.00% (8/8)
src/child/ChildERC20.sol	100.00% (14/14)	100.00% (15/15)	100.00% (2/2)	100.00% (7/7)
src/child/ChildERC20Bridge.sol	99.23% (129/130)	99.43% (175/176)	98.44% (63/64)	100.00% (21/21)
src/child/WIMX.sol	100.00% (19/19)	100.00% (22/22)	100.00% (8/8)	100.00% (6/6)
src/common/AdaptorRoles.sol	100.00% (6/6)	100.00% (6/6)	100.00% (0/0)	100.00% (6/6)
src/common/BridgeRoles.sol	100.00% (8/8)	100.00% (8/8)	100.00% (0/0)	100.00% (8/8)
src/lib/EIP712MetaTransaction.sol	8.00% (2/25)	9.68% (3/31)	8.33% (1/12)	14.29% (1/7)
src/lib/EIP712Upgradeable.sol	73.33% (11/15)	60.87% (14/23)	0.00% (0/2)	50.00% (2/4)
src/lib/WETH.sol	89.47% (17/19)	86.36% (19/22)	87.50% (7/8)	66.67% (4/6)
src/root/RootAxelarBridgeAdaptor.sol	100.00% (51/51)	100.00% (68/68)	100.00% (24/24)	100.00% (8/8)
src/root/RootERC20Bridge.sol	94.07% (127/135)	95.83% (184/192)	87.93% (51/58)	91.30% (21/23)
src/root/flowrate/FlowRateDetection.sol	100.00% (30/30)	100.00% (33/33)	100.00% (14/14)	100.00% (4/4)
src/root/flowrate/FlowRateWithdrawalQueue.sol	100.00% (46/46)	100.00% (60/60)	78.57% (11/14)	100.00% (7/7)
src/root/flowrate/RootERC20BridgeFlowRate.sol	100.00% (42/42)	97.96% (48/49)	100.00% (10/10)	100.00% (9/9)

For a full HTML report run: forge coverage --report lcov && genhtml --ignore-errors category --branch-coverage --output-dir coverage lcov.info