Help: `{<…> | <…>}` → `<…|…>`

The form of alternative names for "placeholders" has been used already
(e.g., `<file|dir>` in the `cmake(1)` manual).

Help/manual/ccmake.1.rst

@@ -8,7 +8,7 @@ Synopsis
 
 .. parsed-literal::
 
- ccmake [<options>] {<path-to-source> | <path-to-existing-build>}
+ ccmake [<options>] <path-to-source | path-to-existing-build>
 
 Description
 ===========

Help/manual/cmake-gui.1.rst

@@ -9,7 +9,7 @@ Synopsis
 .. parsed-literal::
 
  cmake-gui [<options>]
- cmake-gui [<options>] {<path-to-source> | <path-to-existing-build>}
+ cmake-gui [<options>] <path-to-source | path-to-existing-build>
  cmake-gui [<options>] -S <path-to-source> -B <path-to-build>
  cmake-gui [<options>] --browse-manual
 

Help/manual/cmake.1.rst

@@ -9,8 +9,7 @@ Synopsis
 .. parsed-literal::
 
  `Generate a Project Buildsystem`_
-  cmake [<options>] <path-to-source>
-  cmake [<options>] <path-to-existing-build>
+  cmake [<options>] <path-to-source | path-to-existing-build>
   cmake [<options>] -S <path-to-source> -B <path-to-build>
 
  `Build a Project`_