fixups for BIP125 doc cleanup

Grammar and readability fixups.
Clarifies "bip125-replaceable" helpstrings.

src/policy/rbf.h

@@ -19,7 +19,7 @@
 class CFeeRate;
 class uint256;
 
-/** Maximum number of transactions that can be replaced by RBF Rule #5. This includes all
+/** Maximum number of transactions that can be replaced by RBF (Rule #5). This includes all
  * mempool conflicts and their descendants. */
 static constexpr uint32_t MAX_REPLACEMENT_CANDIDATES{100};
 

src/rpc/mempool.cpp

@@ -255,7 +255,7 @@ static std::vector<RPCResult> MempoolEntryDescription()
             {RPCResult{RPCResult::Type::STR_HEX, "transactionid", "parent transaction id"}}},
         RPCResult{RPCResult::Type::ARR, "spentby", "unconfirmed transactions spending outputs from this transaction",
             {RPCResult{RPCResult::Type::STR_HEX, "transactionid", "child transaction id"}}},
-        RPCResult{RPCResult::Type::BOOL, "bip125-replaceable", "Whether this transaction could be replaced due to BIP125 (replace-by-fee)"},
+        RPCResult{RPCResult::Type::BOOL, "bip125-replaceable", "Whether this transaction signals BIP125 replaceability or has an unconfirmed ancestor signaling BIP125 replaceability.\n"},
         RPCResult{RPCResult::Type::BOOL, "unbroadcast", "Whether this transaction is currently unbroadcast (initial broadcast not yet acknowledged by any peers)"},
     };
 }

src/wallet/rpc/spend.cpp

@@ -224,7 +224,7 @@ RPCHelpMan sendtoaddress()
                                          "transaction, just kept in your wallet."},
                     {"subtractfeefromamount", RPCArg::Type::BOOL, RPCArg::Default{false}, "The fee will be deducted from the amount being sent.\n"
                                          "The recipient will receive less bitcoins than you enter in the amount field."},
-                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can replaced by a transaction (BIP 125)"},
+                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can be replaced by a transaction (BIP 125)"},
                     {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks"},
                     {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"
                      "\"" + FeeModes("\"\n\"") + "\""},
@@ -333,7 +333,7 @@ RPCHelpMan sendmany()
                             {"address", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Subtract fee from this address"},
                         },
                     },
-                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can replaced by a transaction (BIP 125)"},
+                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can be replaced by a transaction (BIP 125)"},
                     {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks"},
                     {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"
                      "\"" + FeeModes("\"\n\"") + "\""},

src/wallet/rpc/transactions.cpp

@@ -421,8 +421,8 @@ static const std::vector<RPCResult> TransactionDescriptionString()
            {RPCResult::Type::NUM_TIME, "time", "The transaction time expressed in " + UNIX_EPOCH_TIME + "."},
            {RPCResult::Type::NUM_TIME, "timereceived", "The time received expressed in " + UNIX_EPOCH_TIME + "."},
            {RPCResult::Type::STR, "comment", /*optional=*/true, "If a comment is associated with the transaction, only present if not empty."},
-           {RPCResult::Type::STR, "bip125-replaceable", "(\"yes|no|unknown\") Whether this transaction could be replaced due to BIP125 (replace-by-fee);\n"
-               "may be unknown for unconfirmed transactions not in the mempool."},
+           {RPCResult::Type::STR, "bip125-replaceable", "(\"yes|no|unknown\") Whether this transaction signals BIP125 replaceability or has an unconfirmed ancestor signaling BIP125 replaceability.\n"
+               "May be unknown for unconfirmed transactions not in the mempool because their unconfirmed ancestors are unknown."},
            {RPCResult::Type::ARR, "parent_descs", /*optional=*/true, "Only if 'category' is 'received'. List of parent descriptors for the scriptPubKey of this coin.", {
                {RPCResult::Type::STR, "desc", "The descriptor string."},
            }},