Merge bitcoin/bitcoin#31220: doc: Fix word order in developer-notes.md

44939e5 doc: Fix word order in developer-notes.md (secp512k2)

Pull request description:

  This pull request fixes a word order error in developer-notes.md.

ACKs for top commit:
  fanquake:
    ACK 44939e5

Tree-SHA512: f8c8f2a976940c6fb3483c13c048accd073a8486e0d614ca9da15bf166c41f1f1c1cd57678359af04a32c5ffa15afa647a3f015f89c83997c69803a62fad8de6

doc/developer-notes.md

@@ -959,7 +959,7 @@ Strings and formatting
     - *Rationale*: Qt has built-in functionality for converting their string
       type from/to C++. No need to roll your own.
 
-  - In cases where do you call `.c_str()`, you might want to additionally check that the string does not contain embedded '\0' characters, because
+  - In cases where you do call `.c_str()`, you might want to additionally check that the string does not contain embedded '\0' characters, because
     it will (necessarily) truncate the string. This might be used to hide parts of the string from logging or to circumvent
     checks. If a use of strings is sensitive to this, take care to check the string for embedded NULL characters first
     and reject it if there are any (see `ParsePrechecks` in `strencodings.cpp` for an example).