Adjust documentation script name and images. (project-chip#37584)

This fixes some copy & paste typos from temporary development
of size scripts. Also fixes the display of images for the tool
examples (the gh pages upload did not have the corresponding png).

Co-authored-by: Andrei Litvin <andreilitvin@google.com>

Author: andy31415

docs/conf.py

@@ -72,6 +72,7 @@
     (MATTER_BASE, "examples/**/*.JPG"),
     (MATTER_BASE, "src/tools/**/*.md"),
     (MATTER_BASE, "scripts/tools/**/*.md"),
+    (MATTER_BASE, "scripts/tools/**/*.png"),
 ]
 external_content_link_prefixes = [
     "src/",

scripts/tools/ELF_SIZE_TOOLING.md

@@ -26,7 +26,7 @@ you can build the master branch of a binary and save it somewhere like
 Example runs:
 
 ```
-> ~/devel/chip-scripts/bindiff.py \
+> ./scripts/tools/binary_elf_size_diff.py \
   ./out/qpg-qpg6105-light/chip-qpg6105-lighting-example.out \
   ./out/qpg-master.out
 
@@ -46,7 +46,7 @@ TOTAL       -34
 ```
 
 ```
-> ~/devel/chip-scripts/bindiff.py \
+> ./scripts/tools/binary_elf_size_diff.py \
   --output csv --skip-total       \
   ./out/qpg-qpg6105-light/chip-qpg6105-lighting-example.out ./out/qpg-master.out