docs: Update suggested non-regex note on regex failure

src/main.rs

@@ -496,8 +496,9 @@ fn build_regex(pattern_regex: String, config: &Config) -> Result<regex::bytes::R
         .build()
         .map_err(|e| {
             anyhow!(
-                "{}\n\nNote: You can use the '--fixed-strings' option to search for a \
-                 literal string instead of a regular expression. Alternatively, you can \
+                "{}\n\nNote: You can search for literal substrings with '--fixed-strings' \
+                 or literal strings with '--exact' options (instead of a regular expression). \
+                 Alternatively, you can \
                  also use the '--glob' option to match on a glob pattern.",
                 e
             )