Added a tip block to "getting started" tutorial

[nnmva]

I would like to suggest this small change to add a tip in the Getting Started Tutorial. I was working through it, as a beginner to gremlin console, and I got stuck. I learned about the :clear command, and that helped me to complete it. I think it would be beneficial to other beginners to add this tip in case they find themselves in a similar situation I was in.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.20%. Comparing base (9b46b67) to head (8937518).
Report is 348 commits behind head on 3.7-dev.

Additional details and impacted files

@@              Coverage Diff              @@
##             3.7-dev    #3156      +/-   ##
=============================================
+ Coverage      76.14%   76.20%   +0.06%     
- Complexity     13152    13284     +132     
=============================================
  Files           1084     1091       +7     
  Lines          65160    67639    +2479     
  Branches        7285     7371      +86     
=============================================
+ Hits           49616    51545    +1929     
- Misses         12839    13365     +526     
- Partials        2705     2729      +24     

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[andreachild]

VOTE +1

[Cole-Greer]

Thanks for the suggestion @nnmva, I think that's a great addition.
VOTE +1

[Cole-Greer]

Merging as CTR