make rename doc to match pcb name

doc/devices/PCB-K0501W-V2.0.md

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+# K0501W V2.0
+
+This board appears for example in the Davuaz Da-K6501W switch.
+
+The general design of the board is similar to Hi-K0402WS V3.0.
+However, there are several differences:
+- One SFP port is replaced by a RTL8221B 2.5G PHY
+- Only one LED is populated for the SFP port
+- No mode switch and only one flash chip
+- Older design using RTL8372 instead of RTL8372N (which also means different GPIO and LED configuration)
+- Like earlier versions of the K0402W(S) board, there is no UART
+
+All ports and LEDs are supported.
+Installation is possible using a flash programmer.
+The BoyaMicro 25Q16BSSIG flash chip is supported by flashprog with chip name "B.25D16AS/BY25Q16BS/BY25Q16ES".
+
+## PCB pictures
+
+The board is marked `PCB-K0501W-V2.0 DIP-K0501WS-V2.0`.
+
+<img src="photos/PCB-K0501W-V2.0/pcb-top.jpg" width="300" />
+
+<img src="photos/PCB-K0501W-V2.0/pcb-bottom.jpg" width="300" />