Fix MetaMask setup guide: Update ASTR token name and network name (#728)

Signed-off-by: Armin Teimouri <armin.teimouri@startale.com>

Author: armin-x86

docs/use/evm-guides/setup-metamask.md

@@ -26,10 +26,10 @@ Adding Astar Network to Metamask is very easy.
 Alternatively, you can also set it up manually by giving information bellow.
 <br />
 Network Details<br />
-Network Name: Astar Network Mainnet<br />
+Network Name: Astar<br />
 Network URL: https://evm.astar.network<br />
 Chain ID: 592<br />
-Currency Symbol: astr<br />
+Currency Symbol: ASTR<br />
 Block Explorer URL: https://blockscout.com/astar
 
 :::