website/user: Hello World!

website/docs/user/index.mdx

@@ -73,7 +73,7 @@ xpm run execute
 As expected, the result is:
 
 ```console
-Hello world!
+Hello World!
 ```
 
 :::info
@@ -107,15 +107,15 @@ This adds an empty `package.json` where further definitions will be stored.
 
 ### Add source code
 
-Add a simple C program that prints the traditional _Hello world!_ message:
+Add a simple C program that prints the traditional _Hello World!_ message:
 
 ```c title="xpm-demo-hello/src/hello.c"
 #include <stdio.h>
 
 int
 main (int argc, char* argv[])
 {
-  printf ("Hello world!\n");
+  printf ("Hello World!\n");
 
   return 0;
 }
@@ -330,7 +330,7 @@ PS C:\Users\ilg\xpm-demo-hello> xpm run build
 
 PS C:\Users\ilg\xpm-demo-hello> xpm run execute
 > build\hello
-Hello world!
+Hello World!
 ```
 
 </TabItem>
@@ -346,7 +346,7 @@ Hello world!
 
 % xpm run execute
 > build/hello
-Hello world!
+Hello World!
 ```
 
 </TabItem>
@@ -362,7 +362,7 @@ $ xpm run build
 
 $ xpm run execute
 > build/hello
-Hello world!
+Hello World!
 ```
 
 </TabItem>