docs: powerpc: convert vcpudispatch_stats.txt to ReST

- Add a SPDX header;
- Use standard markup for document title;
- Adjust identation on lists and add blank lines where
needed;
- Add it to the powerpc index.rst file.

Acked-by: Michael Ellerman <[e-mail]> # powerpc
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/a88855[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/powerpc/index.rst

···
     transactional_memory
     ultravisor
     vas-api
+    vcpudispatch_stats
 
 .. only::  subproject and html
 

Documentation/powerpc/vcpudispatch_stats.txt Documentation/powerpc/vcpudispatch_stats.rst

···
-VCPU Dispatch Statistics:
-=========================
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
+VCPU Dispatch Statistics
+========================
 
 For Shared Processor LPARs, the POWER Hypervisor maintains a relatively
 static mapping of the LPAR processors (vcpus) to physical processor
···
 a vcpu as represented by the first field, followed by 8 numbers.
 
 The first number corresponds to:
+
 1. total vcpu dispatches since the beginning of statistics collection
 
 The next 4 numbers represent vcpu dispatch dispersions:
+
 2. number of times this vcpu was dispatched on the same processor as last
    time
 3. number of times this vcpu was dispatched on a different processor core
    as last time, but within the same chip
 4. number of times this vcpu was dispatched on a different chip
 5. number of times this vcpu was dispatches on a different socket/drawer
-(next numa boundary)
+   (next numa boundary)
 
 The final 3 numbers represent statistics in relation to the home node of
 the vcpu:
+
 6. number of times this vcpu was dispatched in its home node (chip)
 7. number of times this vcpu was dispatched in a different node
 8. number of times this vcpu was dispatched in a node further away (numa
-distance)
+   distance)
 
-An example output:
+An example output::
+
     $ sudo cat /proc/powerpc/vcpudispatch_stats
     cpu0 6839 4126 2683 30 0 6821 18 0
     cpu1 2515 1274 1229 12 0 2509 6 0