Updated README in rclc_examples (backport #335)

[mergify[bot]]

This is an automatic backport of pull request #335 done by Mergify. Cherry-pick of 3b4ff9e46ad63ca08a1131760a86b0f42c2bba63 has failed:

On branch mergify/bp/foxy/pr-335
Your branch is up to date with 'origin/foxy'.

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    both modified:   rclc_examples/README.md

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[codecov-commenter]

Codecov Report

Merging #337 (2a1ea1e) into foxy (23c65ba) will decrease coverage by 2.62%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             foxy     #337      +/-   ##
==========================================
- Coverage   62.93%   60.32%   -2.62%     
==========================================
  Files          13       14       +1     
  Lines        1419     1555     +136     
  Branches      416      507      +91     
==========================================
+ Hits          893      938      +45     
- Misses        337      339       +2     
- Partials      189      278      +89     

Impacted Files	Coverage Δ
...c_parameter/test/rclc_parameter/test_parameter.cpp	33.08% <0.00%> (ø)

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