remove leading whitespaces in multi-line descriptions

[firaskafri]

Currently Scalar types and Field types pass description without touching it which is causing the issue of inconsistent white spaces in the case of multi-line descriptions when parsed by federation services.

Addressing issue #1489

[codecov[bot]]

Codecov Report

Base: 95.98% // Head: 95.99% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (2feabac) compared to base (340d5ed). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1490   +/-   ##
=======================================
  Coverage   95.98%   95.99%           
=======================================
  Files          51       51           
  Lines        1742     1746    +4     
=======================================
+ Hits         1672     1676    +4     
  Misses         70       70           

Impacted Files	Coverage Δ
graphene/types/field.py	96.07% <100.00%> (+0.07%)	:arrow_up:
graphene/types/unmountedtype.py	91.66% <100.00%> (+1.19%)	:arrow_up:

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