Merge bitcoin/bitcoin#25299: doc: Correct comments re. units of constants

241c4d0 doc: Correct comment describing value of MAX_FILE_SIZE_PSBT as in MiB (Ben Woosley)
64f81a3 doc: Correct nPruneTarget misidentifying units of variable (darosior)

Pull request description:

  In bitcoin/bitcoin#15848, darosior fixed up a comment which mis-identified the units of a constant.

  Another comment misidentified a value as in MiB rather than MB.

ACKs for top commit:
  laanwj:
    Code review ACK 241c4d0
  darosior:
    ACK 241c4d0, with or without bitcoin/bitcoin#25299 (comment)

Tree-SHA512: 96c03a35140e5c53759f387bd292a8f8f621ba74c3cf6621939fad40f48892d23141c747ad3ab4fd71108e3b737670175abc2eb3990a1bd1660366c55d61ddf8

Author: laanwj

src/node/blockstorage.h

@@ -49,7 +49,7 @@ extern std::atomic_bool fReindex;
 /** Pruning-related variables and constants */
 /** True if we're running in -prune mode. */
 extern bool fPruneMode;
-/** Number of MiB of block files that we're trying to stay below. */
+/** Number of bytes of block files that we're trying to stay below. */
 extern uint64_t nPruneTarget;
 
 // Because validation code takes pointers to the map's CBlockIndex objects, if

src/psbt.h

@@ -54,7 +54,7 @@ static constexpr uint8_t PSBT_SEPARATOR = 0x00;
 
 // BIP 174 does not specify a maximum file size, but we set a limit anyway
 // to prevent reading a stream indefinitely and running out of memory.
-const std::streamsize MAX_FILE_SIZE_PSBT = 100000000; // 100 MiB
+const std::streamsize MAX_FILE_SIZE_PSBT = 100000000; // 100 MB
 
 // PSBT version number
 static constexpr uint32_t PSBT_HIGHEST_VERSION = 0;