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Update LoRa 32 V3.1

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Updated the tab and main header to V3/3.1 and added ### V3.1 differences section.
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docs/hardware/devices/heltec/index.mdx
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@ -14,7 +14,7 @@ queryString="heltec"
defaultValue="v3"
values={[
{label: 'LoRa32 V2.1', value: 'v2.1'},
{label: 'LoRa32 V3', value:'v3'},
{label: 'LoRa32 V3/V3.1', value:'v3'},
{label: 'Wireless Stick Lite V3', value:'Wireless Stick Lite V3'},
{label: 'Wireless Tracker', value: 'tracker'},
{label: 'Wireless Paper', value: 'paper'}
@ -54,14 +54,7 @@ Not recommended because of design issues! Support is being phased out. Use V3 in
<TabItem value="v3">
## HELTEC v3.1
Firmware remains the same as V3 below. Compare schematics: [V3.0](https://web.archive.org/web/20221127054612/https://resource.heltec.cn/download/WiFi_LoRa32_V3/HTIT-WB32LA(F)_V3_Schematic_Diagram.pdf) and [V3.1](https://resource.heltec.cn/download/WiFi_LoRa_32_V3/HTIT-WB32LA(F)_V3.1_Schematic_Diagram.pdf). Key differences:
- Removal of [FDG6322C](https://www.mouser.com/datasheet/2/308/1/FDG6322C_D-2312203.pdf) (a dual N & P channel FET) from the V3.1 power supply.
- Antenna filter values in V3.1 (L11 = 1.8pF, C15 = 2.7nH, C24 = 1.8pF) align more closely with ESP32-S3 reference design than V3.0 (L11 = 1.6nH, C15 = 6.9pF, C24 = 2.4pF).
## HELTEC v3
## HELTEC v3/v3.1
:::info
This device may have issues charging a connected battery if utilizing a USB-C to USB-C cable. It's recommended to use a USB-A to USB-C cable.
@ -82,6 +75,13 @@ This device may have issues charging a connected battery if utilizing a USB-C to
- Dedicated 2.4 GHz metal spring antenna for WiFi/Bluetooth
- U.FL/IPEX antenna connector for LoRa
### V3.1 differences
Firmware remains the same as V3 below. Compare schematics: [V3.0](https://web.archive.org/web/20221127054612/https://resource.heltec.cn/download/WiFi_LoRa32_V3/HTIT-WB32LA(F)_V3_Schematic_Diagram.pdf) and [V3.1](https://resource.heltec.cn/download/WiFi_LoRa_32_V3/HTIT-WB32LA(F)_V3.1_Schematic_Diagram.pdf). Key differences:
- Removal of [FDG6322C](https://www.mouser.com/datasheet/2/308/1/FDG6322C_D-2312203.pdf) (a dual N & P channel FET) from the V3.1 power supply.
- Antenna filter values in V3.1 (L11 = 1.8pF, C15 = 2.7nH, C24 = 1.8pF) align more closely with ESP32-S3 reference design than V3.0 (L11 = 1.6nH, C15 = 6.9pF, C24 = 2.4pF).
### Features
- Built in 0.96 inch OLED display