docs: Update private network config (#25310)

* Update Private-Network.md

I updated the example genesis.json so that it matches mainnet's HF from block 0. 

The reason I think this is a positive change is that users get confused by tools not behaving like their private network by default: https://github.com/NomicFoundation/hardhat/issues/2946

* add missing double quote

Co-authored-by: Guillaume Ballet <3272758+gballet@users.noreply.github.com>

docs/_interface/Private-Network.md

@@ -278,6 +278,12 @@ In each data directory save a copy of the following `genesis.json` to the top le
     "byzantiumBlock": 0,
     "constantinopleBlock": 0,
     "petersburgBlock": 0,
+    "istanbulBlock": 0,
+    "muirGlacierBlock": 0,
+    "berlinBlock": 0,
+    "londonBlock": 0,
+    "arrowGlacierBlock": 0,
+    "grayGlacierBlock": 0,
     "clique": {
       "period": 5,
       "epoch": 30000