Fix formatting for Astra 2 entry in README

Author: zhonghong322

README.md

@@ -9,7 +9,7 @@ This repository is used to store download links for firmware.
 | Femto Mega       | [Femto Mega Firmware](https://github.com/orbbec/OrbbecFirmware/releases/tag/Femto-Mega-Firmware) |     v1.3.1       |
 | Gemini 2       |  [Gemini 2 Firmware ](https://github.com/orbbec/OrbbecFirmware/releases/tag/Gemini2-Firmware)|     v1.4.98      |
 | Gemini 2 L       | [Gemini 2L Firmware ](https://github.com/orbbec/OrbbecFirmware/releases/tag/Gemini2L-Firmware)|     v1.5.02       |
-| Astra 2       | [Astra2]() |     v2.8.20       |
+| Astra 2       | [Astra 2]() |     v2.8.20      |
 | Femto Mega I       | [Femto Mega I Firmware](https://github.com/orbbec/OrbbecFirmware/releases/tag/Femto-Mega-I-Firmware) |     v2.0.4       |
 | Gemini 330 series  |  [Gemini 330 series Firmware](https://www.orbbec.com/docs/g330-firmware-release/?_gl=1)   |          |
 | Gemini 215       | [Gemini 215](https://github.com/orbbec/OrbbecFirmware/releases/tag/Gemini215-Firmware) |     v1.0.9       |