fix(doc): Simplify explanation of extended topology leaf

The original doc lacks some normalization. For example,
CPUID.(EAX=0xB,ECX=N):ECX[7:0] and CPUID.(EAX=0xB,ECX=N).EDX[31:00].
Honestly, there is not much value describing the details of the extended
topology leaf, because no CPU features are enumerated in it and no
reason to modify it using CPU template from users' perspective. Let's
simply the description.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

docs/cpu_templates/cpuid-normalization.md

@@ -22,9 +22,7 @@ See also: [boot protocol settings](boot-protocol.md)
 | Enable HYPERVISOR                                                                    |    0x1     |    -    |      ECX      |  31   |
 | Set HTT value if the microVM's CPU count is greater than 1                           |    0x1     |    -    |      EDX      |  28   |
 | Insert leaf 0xb, subleaf 0x1 if not present                                          |    0xb     |   0x1   |      all      |  all  |
-| Update extended topology enumeration                                                 |    0xb     |   all   |      EAX      |  4:0  |
-| Update extended topology enumeration                                                 |    0xb     |   all   |      EBX      | 15:0  |
-| Update extended topology enumeration                                                 |    0xb     |   all   |      ECX      | 15:8  |
+| Fill extended topology enumeration leaf                                              |    0xb     |   all   |      all      |  all  |
 | Pass through L1 cache and TLB information from host                                  | 0x80000005 |    -    |      all      |  all  |
 | Pass through L2 cache and TLB and L3 cache information from host                     | 0x80000006 |    -    |      all      |  all  |