Clean up vertical whitespace

SC1012.md

@@ -22,14 +22,16 @@ var="$(printf 'foo\tbar')"  # Equivalent alternative
 ```
 
 or
+
 ```sh
 # Literal, quoted linefeed
 line="foo
 bar"
 ```
+
 ### Rationale:
 
-ShellCheck has found a `\t`, `\n` or `\r` in a context where they just become regular letter `t`, `n` or `r`. Most likely, it was intended as a tab, linefeed or carriage return.
+ShellCheck has found a `\t`, `\n` or `\r` in a context where they just become regular letters `t`, `n` or `r`. Most likely, it was intended as a tab, linefeed or carriage return.
 
 To generate such characters (plus other less common ones including `\a`, `\f` and octal escapes) , use `printf` as in the example. The exception is for linefeeds that would be stripped by command substitution; in these cases, use a literal quoted linefeed instead.