Change texts to include (LTI Links)

[dac514]

• Change texts to include (LTI Links)
• Fix imsglobal.org validator warnings

Related to: pressbooks/pressbooks#1699

[codecov]

Codecov Report

Merging #48 into dev will increase coverage by 0.1%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##               dev      #48     +/-   ##
==========================================
+ Coverage     73.6%   73.71%   +0.1%     
- Complexity     293      294      +1     
==========================================
  Files            9        9             
  Lines         1004     1008      +4     
==========================================
+ Hits           739      743      +4     
  Misses         265      265

Impacted Files	Coverage Δ	Complexity Δ
inc/class-admin.php	82.04% <70%> (+0.29%)	81 <1> (+1)	⬆️

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[codecov]

Codecov Report

Merging #48 into dev will increase coverage by 0.4%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##               dev    #48     +/-   ##
========================================
+ Coverage     73.6%    74%   +0.4%     
- Complexity     293    294      +1     
========================================
  Files            9      9             
  Lines         1004   1008      +4     
========================================
+ Hits           739    746      +7     
+ Misses         265    262      -3

Impacted Files	Coverage Δ	Complexity Δ
inc/class-admin.php	83.26% <100%> (+1.52%)	81 <1> (+1)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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