doc: Fix typo and grammar #23254

Fix typo and grammar in the coin selection algorithm's description.

Concept ACK

The PR corrects grammatical errors and typos in the coinselection.cpp file. The changes look good and improve the correctness of the sentence.

I have some more suggestions that you might look at that will help make this PR even better. (The changes were made using Grammarly Premium)

diff --git a/src/wallet/coinselection.cpp b/src/wallet/coinselection.cpp
index c0ca93136..96505a356 100644
--- a/src/wallet/coinselection.cpp
+++ b/src/wallet/coinselection.cpp
@@ -26,11 +26,11 @@ struct {
  * set that can pay for the spending target and does not exceed the spending target by more than the
  * cost of creating and spending a change output. The algorithm uses a depth-first search on a binary
  * tree. In the binary tree, each node corresponds to the inclusion or the omission of a UTXO. UTXOs
- * are sorted by their effective values and the tree is explored deterministically per the inclusion
+ * are sorted by their effective values, and the tree is explored deterministically per the inclusion
  * branch first. At each node, the algorithm checks whether the selection is within the target range.

- * While the selection has not reached the target range, more UTXOs are included. When a selection's
- * value exceeds the target range, the complete subtree deriving from this selection can be omitted.
- * At that point, the last included UTXO is deselected and the corresponding omission branch explored
+ * While the selection has not reached the target range, more UTXOs are included. The complete subtree
+ * deriving from this selection can be omitted when a selection's value exceeds the target range.
+ * At that point, the last included UTXO is deselected, and the corresponding omission branch is explored
  * instead. The search ends after the complete tree has been searched or after a limited number of tries.
  *

ACK ffd11ea87640c8a3d83b6f83ac18e65234fc6002