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Opta, ModBus RTU: Fix headings (#882)

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content/hardware/05.pro-solutions/solutions-and-kits/opta/tutorials/getting-started-with-modbus-rtu
- content.md

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Original file line number	Diff line number	Diff line change
`@@ -34,7 +34,7 @@ The Modbus RTU protocol is one of the protocols available within OptaTM. In thi`
`34`	`34`
`35`	`35`	`### Required Hardware and Software`
`36`	`36`
`37`		`-### Hardware Requirements`
	`37`	`+#### Hardware Requirements`
`38`	`38`
`39`	`39`	`- OptaTM PLC with RS-485 support (x2)`
`40`	`40`	`- 12VDC/1A DIN rail power supply (x1)`
`@@ -43,7 +43,7 @@ The Modbus RTU protocol is one of the protocols available within OptaTM. In thi`
`43`	`43`	`- STP/UTP 24-18AWG (Unterminated) 100-130Ω rated`
`44`	`44`	`- STP/UTP 22-16AWG (Terminated) 100-130Ω rated`
`45`	`45`
`46`		`-### Software Requirements`
	`46`	`+#### Software Requirements`
`47`	`47`
`48`	`48`	`- [Arduino IDE 1.8.10+](https://www.arduino.cc/en/software), [Arduino IDE 2.0+](https://www.arduino.cc/en/software), or [Arduino Web Editor](https://create.arduino.cc/editor)`
`49`	`49`	- If you choose an offline Arduino IDE, you must install the following libraries: `ArduinoRS485`, and `ArduinoModbus`. You can install these libraries via Library Manager of the Arduino IDE.

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