fix(AM68A): repair cma toc tree entry

This is case sensitive. A typo was resulting in a failed match.

Fixes: 1af0207 (fix: configs: Add CMA Guide to Plaforms TOC, 2025-03-24)
Signed-off-by: Randolph Sapp <rs@ti.com>

Author: StaticRocket

configs/AM68A/AM68A_linux_toc.txt

@@ -126,7 +126,7 @@ linux/How_to_Guides/FAQ/How_to_Integrate_Open_Source_Software
 linux/How_to_Guides/Host/How_to_Build_a_Ubuntu_Linux_host_under_VMware
 linux/How_to_Guides_Hardware_Setup_with_CCS
 linux/How_to_Guides/Hardware_Setup_with_CCS/AM68_SK_Hardware_Setup
-linux/How_to_Guides/Target/How_To_Carve_out_CMA
+linux/How_to_Guides/Target/How_To_Carve_Out_CMA
 
 linux/Documentation_Tarball