Add default append value to __StringToFile

[jmetertea]

Description

Documentation missing default append value in new __StringToFile function

Motivation and Context

Add default append value to __StringToFile documentation

How Has This Been Tested?

The default value for append is true

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #543 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #543      +/-   ##
============================================
+ Coverage     56.11%   56.12%   +<.01%     
- Complexity    10018    10020       +2     
============================================
  Files          1024     1024              
  Lines         62912    62912              
  Branches       7066     7066              
============================================
+ Hits          35305    35307       +2     
+ Misses        25131    25130       -1     
+ Partials       2476     2475       -1

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/jmeter/reporters/Summariser.java	86.25% <0%> (+1.52%)	19% <0%> (+2%)	⬆️

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