fix: language + export param fields

docs/adr/adr-013-bootstrap-from-previous-peers.md

@@ -138,9 +138,11 @@ where are `OnBlockedPeer` will be called whenever `peerTracker` blocks a peer th
 +       p.onBlockedPeer(PIDToAddrInfo(pID))
  }
 ```
-We are assuming a function named `PIDToAddrInfo` that converts a `peer.ID` to a `peer.AddrInfo` struct for this example's purpose. 
+
+We are assuming a function named `PIDToAddrInfo` that converts a `peer.ID` to a `peer.AddrInfo` struct for this example's purpose.
 
 The `peerTracker`'s constructor should be updated to accept these new event handlers:
+
 ```diff
 +++ go-header/p2p/peer_tracker.go
  type peerTracker struct {
@@ -169,8 +171,8 @@ as well as the `libhead.Exchange`'s options and construction:
         // chainID is an identifier of the chain.
         chainID string
 +
-+       onUpdatedPeers func([]peer.AddrInfo)
-+       onBlockedPeer func(peer.AddrInfo)
++       OnUpdatedPeers func([]peer.AddrInfo)
++       OnBlockedPeer func(peer.AddrInfo)
  }
  ```
 
@@ -211,13 +213,14 @@ as well as the `libhead.Exchange`'s options and construction:
  ```
 
 And then define `libhead.Exchange` options to set the event handlers on the `peerTracker`:
+
 ```go
 +++ go-header/p2p/options.go
 func WithOnUpdatedPeers(f func([]]peer.ID)) Option[ClientParameters] {
        return func(p *ClientParameters) {
                switch t := any(p).(type) { //nolint:gocritic
                case *PeerTrackerParameters:
-                       p.onUpdatedPeers = f
+                       p.OnUpdatedPeers = f
                }
        }
 }
@@ -226,7 +229,7 @@ func WithOnBlockedPeer(f func([]]peer.ID)) Option[ClientParameters] {
        return func(p *ClientParameters) {
                switch t := any(p).(type) { //nolint:gocritic
                case *PeerTrackerParameters:
-                       p.onBlockedPeer = f
+                       p.OnBlockedPeer = f
                }
        }
 }
@@ -237,7 +240,7 @@ The event handlers to be supplied are callbacks that either:
 1. Put the new peer list into the peer store
 2. Remove a blocked peer from the peer store
 
-Such callbacks are easily passable as options sat header module construction time, example:
+Such callbacks are easily passable as options at header module construction time, example:
 
 ```go
 // newP2PExchange constructs a new Exchange for headers.
@@ -335,7 +338,6 @@ Proposed
 
 * Allows nodes to bootstrap from previously seen peers, which allows the network to gain more decentralization.
 
-
 <!-- 
 > This section does not need to be filled in at the start of the ADR, but must be completed prior to the merging of the implementation.
 >