fix: English grammar and spelling corrections across Lichee docs

[stan-smith]

RV/user.md (11 fixes)

'wo communicate' -> 'to communicate'
'lht last line' -> 'the last line'
'succeed login OS' -> 'successfully logging into the OS'
'stat blink LED' -> 'start to blink the LED'
'siginal number' -> 'signal number'
'succeeded Lighting led' -> 'succeeded in lighting the LED'
'The users name' -> 'The username'
'debian OS' -> 'Debian OS'
'succeeding connecting network' -> 'successfully connecting to the network'
'tina os' -> 'Tina OS'
'de some basic operations' -> 'do some basic operations'
'720P 720p' -> '720P'
'tina OS' -> 'Tina OS'
'succeed running' -> 'succeeding'

RV/flash.md (3 fixes)

'Connect you sd card' -> 'Connect your SD card'
'tf card provided by sipeed' -> 'TF card provided by Sipeed'
'Waiting for finishing burning, It' -> 'Waiting for finishing burning. It'

RV/ubuntu.md (4 fixes)

'We have upload Windows edition' -> 'We have uploaded Windows edition'
'your computer dose not' -> 'your computer does not'
'Based in [Ubuntu' -> 'Based on [Ubuntu'
'make user more convenient' -> 'makes it more convenient for users'
'Tuen on LED' -> 'Turn on LED'

RV/Dock.md (3 fixes)

'development kits' -> 'development kit'
'opensource developer' -> 'open-source developers'
'An user's key' -> 'A user key'

RV/RV.md (2 fixes)

'tf card' -> 'TF card'
'Pre made images' -> 'Pre-made images'

RV/problems.md (1 fix)

'Apt trouble' -> 'Apt Troubleshooting'

RV/86_panel.md (1 fix)

'Reserver 8-inch' -> 'Reserved 8-inch'

K1/lpi3a/1_intro.md (1 fix)

'High performance RISC-V linux development board' -> 'high-performance RISC-V Linux development board'

K1/lpi3a/2_unbox.md (2 fixes)

'Basic Suit' -> 'Basic Suite'
'automatically downshift' -> 'automatically throttle'

K1/lpi3a/4_peripheral.md (2 fixes)

'## USB ' -> '## USB' (removed trailing space)
'replace the dtb' -> 'replace the DTB'

K1/lc3a/lc3a.md (1 fix)

'heat radiation' -> 'heat dissipation'

th1520/lbook4a/lbook4a.md (1 fix)

'Inoput' -> 'Input'

th1520/lpi4a/1_intro.md (1 fix)

'64KB I cache amd' -> '64KB I cache and'

th1520/lpi4a/2_unbox.md (4 fixes)

'Offical Version' -> 'Official Version'
'seperatly' -> 'separately'
're-arragnet' -> 'rearranged'
Various 'POE' -> 'PoE' standardizations