Merge bitcoin#19390: doc/REST-interface: Remove stale info

fd9c213 doc/REST-interface: Remove stale info (Luke Dashjr)

Pull request description:

  Clean merge to 0.19+

ACKs for top commit:
  fanquake:
    ACK fd9c213
  MarcoFalke:
    ACK fd9c213

Tree-SHA512: ac3ffaa72226380ed8b8ab505518d0dc4350bfcc4625dfd27a2350fbb972a8d2bb4255307926eb331c49232023bcb283a659f0d87e4ecbf654982341242f7d36

doc/REST-interface.md

@@ -59,7 +59,6 @@ Only supports JSON as output format.
 * pruned : (boolean) if the blocks are subject to pruning
 * pruneheight : (numeric) highest block available
 * softforks : (array) status of softforks in progress
-* bip9_softforks : (object) status of BIP9 softforks in progress
 
 #### Query UTXO set
 `GET /rest/getutxos/<checkmempool>/<txid>-<n>/<txid>-<n>/.../<txid>-<n>.<bin|hex|json>`
@@ -77,7 +76,6 @@ $ curl localhost:19998/rest/getutxos/checkmempool/b2cdfd7b89def827ff8af7cd9bff76
    "bitmap": "1",
    "utxos" : [
       {
-         "txvers" : 1
          "height" : 2147483647,
          "value" : 8.8687,		 
          "scriptPubKey" : {