Help: Fix typo that crashes older pygments lexers

In commit cb14ae2b87 (try_compile: Add SOURCE_FROM_{ARG,VAR},
2022-09-21, v3.25.0-rc1~94^2~2) we accidentally added unbalanced closing
`]` characters in the `try_compile` and `try_run` signatures.

Fixes: #24053

Help/command/try_compile.rst

@@ -59,10 +59,10 @@ Try Compiling Source Files
 .. code-block:: cmake
 
   try_compile(<resultVar>
-              <SOURCES <srcfile...>]                 |
-               SOURCE_FROM_CONTENT <name> <content>] |
-               SOURCE_FROM_VAR <name> <var>]         |
-               SOURCE_FROM_FILE <name> <path>        >...
+              <SOURCES <srcfile...>                 |
+               SOURCE_FROM_CONTENT <name> <content> |
+               SOURCE_FROM_VAR <name> <var>         |
+               SOURCE_FROM_FILE <name> <path>       >...
               [NO_CACHE]
               [CMAKE_FLAGS <flags>...]
               [COMPILE_DEFINITIONS <defs>...]

Help/command/try_run.rst

@@ -13,10 +13,10 @@ Try Compiling and Running Source Files
 .. code-block:: cmake
 
   try_run(<runResultVar> <compileResultVar>
-          <SOURCES <srcfile...>]                 |
-           SOURCE_FROM_CONTENT <name> <content>] |
-           SOURCE_FROM_VAR <name> <var>]         |
-           SOURCE_FROM_FILE <name> <path>        >...
+          <SOURCES <srcfile...>                 |
+           SOURCE_FROM_CONTENT <name> <content> |
+           SOURCE_FROM_VAR <name> <var>         |
+           SOURCE_FROM_FILE <name> <path>       >...
           [NO_CACHE]
           [CMAKE_FLAGS <flags>...]
           [COMPILE_DEFINITIONS <defs>...]