message: update jemalloc & tcmalloc installation guide
diff: @@ -215,12 +215,9 @@ export LD_PRELOAD=<jemalloc.so/tcmalloc.so>:$LD_PRELOAD
  A recommended setting for ``MALLOC_CONF`` is ``oversize_threshold:1,background_thread:true,metadata_thp:auto,dirty_decay_ms:9000000000,muzzy_decay_ms:9000000000`` from performance perspective. However, in some cases the ``dirty_decay_ms:9000000000,mmuzzy_decay_ms:9000000000`` may cause Out-of-Memory crash. Try ``oversize_threshold:1,background_thread:true,metadata_thp:auto`` instead in this case.
  Getting Jemalloc is straight-forward.
  +
  ```
  -git clone https://github.com/jemalloc/jemalloc
  -cd jemalloc
  -./autogen.sh
  -make
  -make install
  +conda install -c conda-forge jemalloc
  ```
  #### TCMalloc
  @@ -230,12 +227,7 @@ make install
  Getting TCMalloc is also not complicated.
  ```
  -wget https://github.com/gperftools/gperftools/releases/download/gperftools-<version>/gperftools-<version>.tar.gz
  -tar xzvf gperftools-<version>.tar.gz
  -cd gperftools-<version>
  -./configure --disable-cpu-profiler --disable-heap-profiler --disable-heap-checker --disable-debugalloc --enable-minimal
  -make
  -make install
  +conda install -c conda-forge gperftools
  ```
  ### Denormal Number
  