fix: sfem example typo errors

[moe-ad]

Description

Some typo errors were noticed on the example page

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have reviewed my changes before submitting this pull request.
• I have assigned this PR to myself.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.12%. Comparing base (ccc39fe) to head (d2810cc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3711   +/-   ##
=======================================
  Coverage   88.11%   88.12%           
=======================================
  Files         187      187           
  Lines       14707    14707           
=======================================
+ Hits        12959    12960    +1     
+ Misses       1748     1747    -1     

[moe-ad]

@germa89 can we give this a quick merge? Made some corrections.
I am guessing you would have to run the cache clearing job again as well?

[germa89]

LGTM!