Merge bitcoin/bitcoin#32662: doc: Remove build instruction for running clang-tidy

4b1b36a doc: Remove build instruction for running `clang-tidy` (Hennadii Stepanov)

Pull request description:

  One of the benefits of using a compilation database, which is available after the CMake build system generation step, is that it is not necessary to actually build the code in order to run `clang-tidy`.

ACKs for top commit:
  TheCharlatan:
    ACK 4b1b36a
  janb84:
    ACK 4b1b36a

Tree-SHA512: cf28fb1bcff83016b927522f1c719f3b91df7d107a310250c550308c8544b212fa6d2e8a5502d69fa424421acdf952469edd67504ac2a8465a2c1520593a1f26

Author: fanquake

doc/developer-notes.md

@@ -221,7 +221,6 @@ Configure with clang as the compiler:
 
 ```sh
 cmake -B build -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
-cmake --build build -j $(nproc)
 ```
 
 The output is denoised of errors from external dependencies.