spelling error fixed (#20618)

guide/english/bash/bash-cat/index.md

@@ -17,7 +17,7 @@ cat [options] [file_names]
 
 Most used options:
 
-* `-b`, numer non-blank output lines
+* `-b`, number non-blank output lines
 * `-n`, number all output lines
 * `-s`, squeeze multiple adjacent blank lines
 * `-v`, display nonprinting characters, except for tabs and the end of line character