doc: update changelog for n100 sdk v0.2.1 release

Signed-off-by: Huaqi Fang <578567190@qq.com>

Author: fanghuaqi

doc/source/changelog.rst

@@ -6,6 +6,14 @@ Changelog
 V0.2.1
 -------
 
+.. note::
+
+    - Please use Nuclei N100 SDK with **Nuclei Studio 2025.02**, get it from https://nucleisys.com/download.php#tools
+    - For Terapines ZCC toolchain, please download it from https://www.terapines.com/products/zcc and replace
+     Nuclei Studio IDE ``toolchain/zcc`` folder existing content
+
+This is release version ``0.2.1`` of N100 SDK.
+
 * SoC
 
   - Fix missing return for IRQC_Register_IRQ for evalsoc

doc/source/develop/buildsystem.rst

@@ -595,7 +595,7 @@ Currently it has these cores supported as described in table
 .. _table_dev_buildsystem_6:
 
 .. table:: Supported Nuclei Processor cores
-   :widths: 20 20 20
+   :widths: 20 20 20 30
    :align: center
 
    ==========  ==============   =======  =================