Update docs/FAQ.md

Co-authored-by: Alessio Perugini <[email protected]>

docs/FAQ.md

@@ -11,7 +11,7 @@ When you run [`arduino-cli board list`][arduino cli board list], your board does
 
 FQBN stands for Fully Qualified Board Name. It has the following format:
 `VENDOR:ARCHITECTURE:BOARD_ID[:MENU_ID=OPTION_ID[,MENU2_ID=OPTION_ID ...]]`, with `MENU_ID=OPTION_ID` being
-configuration key-value pairs. Each field accepts letters (`A-Z` or `a-z`), numbers (`0-9`), underscores (`_`),
+a key-value pairs configuration. Each field accepts letters (`A-Z` or `a-z`), numbers (`0-9`), underscores (`_`),
 dashes(`-`) and dots(`.`). The special character `=` is accepted in the configuration value. For a deeper understanding
 of how FQBN works, you should understand the [Arduino platform specification][0].