chore: updating all.sas

Add macro trigger to usage example

.all-contributorsrc

@@ -153,6 +153,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "andyjessen",
+      "name": "andyjessen",
+      "avatar_url": "https://avatars.githubusercontent.com/u/62343929?v=4",
+      "profile": "https://github.com/andyjessen",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -248,7 +248,7 @@ The following repositories are also worth checking out:
 
 ## Contributors ✨
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-14-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-15-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
 
@@ -275,6 +275,9 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/henrik-forsell"><img src="https://avatars.githubusercontent.com/u/109935936?v=4?s=100" width="100px;" alt="Henrik Forsell"/><br /><sub><b>Henrik Forsell</b></sub></a><br /><a href="https://github.com/sasjs/core/commits?author=henrik-forsell" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://rudvfaden.github.io/"><img src="https://avatars.githubusercontent.com/u/2445577?v=4?s=100" width="100px;" alt="Rud Faden"/><br /><sub><b>Rud Faden</b></sub></a><br /><a href="https://github.com/sasjs/core/commits?author=rudvfaden" title="Code">💻</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/andyjessen"><img src="https://avatars.githubusercontent.com/u/62343929?v=4?s=100" width="100px;" alt="andyjessen"/><br /><sub><b>andyjessen</b></sub></a><br /><a href="https://github.com/sasjs/core/commits?author=andyjessen" title="Documentation">📖</a></td>
+    </tr>
   </tbody>
 </table>
 

all.sas

@@ -1684,7 +1684,7 @@ Usage:
 
   Usage:
 
-      %put mf_isblank(&var);
+      %put %mf_isblank(&var);
 
   inspiration:
   https://support.sas.com/resources/papers/proceedings09/022-2009.pdf

base/mf_isblank.sas

@@ -7,7 +7,7 @@
 
   Usage:
 
-      %put mf_isblank(&var);
+      %put %mf_isblank(&var);
 
   inspiration:
   https://support.sas.com/resources/papers/proceedings09/022-2009.pdf