Added nested meta repo remark, and minor fixes

[szero2one]

Added a remark concerning nested meta repos, and proposed an alternative solution. Simplified some title names, and cleaned up the nested list.

[codecov-io]

Codecov Report

Merging #205 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   48.27%   48.27%           
=======================================
  Files           1        1           
  Lines          29       29           
  Branches        5        5           
=======================================
  Hits           14       14           
  Misses         11       11           
  Partials        4        4

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[mateodelnorte]

Sorry, this is not correct. Nested meta repos are completely supported, you just have to cd into the directly of the nested .meta file and initiate commands there. Automatic traversing of meta projects, including nesting, is not supported. But that's a feature, not a bug.