Correct spelling (#4152)

crates/nu-command/src/commands/platform/ansi/gradient.rs

@@ -170,7 +170,7 @@ fn action(
                     Ok(UntaggedValue::string(gradient_string).into_value(tag))
                 }
                 (None, Some(fg_end), None, Some(bg_end)) => {
-                    // missin fg_start and bg_start, so assume black
+                    // missing fg_start and bg_start, so assume black
                     let fg_start = Rgb::new(0, 0, 0);
                     let bg_start = Rgb::new(0, 0, 0);
                     let fg_gradient = Gradient::new(fg_start, fg_end);

crates/nu-command/src/commands/strings/str_/trim/command.rs

@@ -144,7 +144,7 @@ fn trim(s: &str, char_: Option<char>, closure_flags: &ClosureFlags) -> String {
             let re_str = format!("{}{{2,}}", reg);
             // create the regex
             let re = regex::Regex::new(&re_str).expect("Error creating regular expression");
-            // replace all mutliple occurances with single occurences represented by r
+            // replace all multiple occurrences with single occurrences represented by r
             let new_str = re.replace_all(&return_string, r.to_string());
             // update the return string so the next loop has the latest changes
             return_string = new_str.to_string();