docs: fix callouts, wiki references, and improve hardware pages (#7204)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/hardware/dma-mapping-nv14.md

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+---
+hide:
+  - toc
+---
+
 # DMA Mapping of NV14
 
 ## DMA1

docs/hardware/dma-mapping-tx16s.md

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+---
+hide:
+  - toc
+---
+
 # DMA Mapping of TX16S
 
 ## DMA1

docs/hardware/irq-usage-tx16s.md

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+---
+hide:
+  - toc
+---
+
 # IRQ Usage of TX16S
 
 | IRQn | IRQ handler acronym                                                | Used for              | Priority | Prio Addr  | Description                                 | Address    |

docs/hardware/radio-specs.md

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 # Radio Hardware Specifications for EdgeTX
 
-See: https://edgetx.org/Radio-hardware-specifications-for-EdgeTX/
+The radio hardware specifications — covering supported targets, MCU types, flash and RAM sizes, and peripheral availability — are maintained on the EdgeTX website:
+
+**[Radio Hardware Specifications for EdgeTX](https://edgetx.org/Radio-hardware-specifications-for-EdgeTX/)**
+
+The table on that page includes, for each supported radio, details such as:
+
+- **MCU** — processor model and clock speed
+- **Flash** — total flash memory available and amount used by EdgeTX
+- **RAM** — total SRAM and CCM RAM
+- **Internal module** — RF protocol of the built-in module (if any)
+- **External module bay** — whether a JR-style external module bay is present
+- **SD card** — whether an SD card slot is present
+- **Audio** — speaker and/or audio jack availability
+- **USB** — USB connectivity type
+- **Bluetooth** — whether Bluetooth is present
+- **GPS** — whether an internal GPS module is present
+- **Color display** — whether the radio has a color screen