Add mt lib build to CL, shuffle around bugs section (facebook#2638)

CHANGELOG

@@ -18,21 +18,22 @@ perf: Significant speed improvements for middle compression levels (#2494, @senh
 perf: Block splitter to improve compression ratio, enabled by default for high compression levels (#2447, @senhuang42)
 perf: Decompression loop refactor, speed improvements on `clang` and for `--long` modes (#2614 #2630, @Cyan4973)
 perf: Reduced stack usage during compression and decompression entropy stage (#2522 #2524, @terrelln)
-bug: Make the number of physical CPU cores detection more robust (#2517, @PaulBone)
 bug: Improve setting permissions of created files (#2525, @felixhandte)
 bug: Fix large dictionary non-determinism (#2607, @terrelln)
-bug: Fix various dedicated dictionary search bugs (#2540 #2586, @senhuang42 @felixhandte)
 bug: Fix non-determinism test failures on Linux i686 (#2606, @terrelln)
+bug: Fix various dedicated dictionary search bugs (#2540 #2586, @senhuang42 @felixhandte)
+bug: Ensure `ZSTD_estimateCCtxSize*() `monotonically increases with compression level (#2538, @senhuang42)
 bug: Fix UBSAN error in decompression (#2625, @terrelln)
 bug: Fix superblock compression divide by zero bug (#2592, @senhuang42)
-bug: Ensure `ZSTD_estimateCCtxSize*() `monotonically increases with compression level (#2538, @senhuang42)
+bug: Make the number of physical CPU cores detection more robust (#2517, @PaulBone)
 doc: Improve `zdict.h` dictionary training API documentation (#2622, @terrelln)
 doc: Note that public `ZSTD_free*()` functions accept NULL pointers (#2521, @animalize)
 doc: Add style guide docs for open source contributors (#2626, @Cyan4973)
 tests: Better regression test coverage for different dictionary modes (#2559, @senhuang42)
 tests: Better test coverage of index reduction (#2603, @terrelln)
 tests: OSS-Fuzz coverage for seekable format (#2617, @senhuang42)
 tests: Test coverage for ZSTD threadpool API (#2604, @senhuang42)
+build: Dynamic library built multithreaded by default (#2584, @senhuang42)
 build: Move  `zstd_errors.h`  and  `zdict.h`  to  `lib/`  root (#2597, @terrelln)
 build: Allow `ZSTDMT_JOBSIZE_MIN` to be configured at compile-time, reduce default to 512KB (#2611, @Cyan4973)
 build: Single file library build script moved to `build/` directory (#2618, @felixhandte)