Fix typos in README
Fix a broken link as well as updating the text.
Merges
## SPI master example
-This code displays a simple graphics with varying pixel colors on the 320x240 LCD on an ESP-WROVER-KIT board.
+This code displays some simple graphics with varying pixel colors on the 320x240 LCD on an ESP-WROVER-KIT board.
-If you like to adopt this example to another type of display or pinout, check [manin/spi_master_example_main.c] for comments that explain some of implementation details.
+If you would like to adopt this example to another type of display or pinout check [main/spi_master_example_main.c] for comments that explain some of the implementation details.
