Rephrase and better position numeric entry help box

Author: jacbn

src/app/components/content/IsaacNumericQuestion.tsx

@@ -107,7 +107,7 @@ const IsaacNumericQuestion = ({doc, questionId, validationResponse, readonly}: I
                 </IsaacContentValueOrChildren>
             </div>
             <Row className="no-print">
-                <Col className="d-flex flex-column flex-md-row">
+                <Col xs={12} className="d-flex flex-column flex-md-row">
                     <div className="d-flex flex-column numeric-value w-100 w-md-50 mb-2">
                         Value
                         <InputGroup className={"feedback-zone nq-feedback separate-input-group flex-grow-1"}>
@@ -155,15 +155,13 @@ const IsaacNumericQuestion = ({doc, questionId, validationResponse, readonly}: I
                         </Dropdown>
                     </div>}
                 </Col>
-                {!readonly && isPhy && above['md'](deviceSize) && <>
-                    <div className="pt-2">
-                        <Button className="numeric-help d-flex align-items-center p-0 gap-2" type="button" color="link" size="sm" innerRef={helpTooltip}>
-                            <i className="icon icon-info layered icon-color-grey"/>
-                            Show me some examples
-                        </Button>
-                    </div>
+                {!readonly && isPhy && above['md'](deviceSize) && <Col xs={12}>
+                    <Button className="numeric-help d-flex align-items-center m-0 p-0 gap-2 text-muted small" type="button" color="link" size="sm" innerRef={helpTooltip}>
+                        <i className="icon icon-info layered icon-color-grey"/>
+                        What can I type in this box?
+                    </Button>
                     {tooltip}
-                </>}
+                </Col>}
             </Row>
             <QuestionInputValidation userInput={currentAttemptValue ?? ""} validator={numericInputValidator} />
         </div>

src/scss/phy/questions.scss

@@ -106,6 +106,7 @@
 .numeric-question {
   .numeric-help.numeric-help {
     color: $color-neutral-900;
+    font-size: 0.875rem;
   }
 
   .unit-selection {