Added unicode character

Author: MarkTheHopeful

docs/src/md/kotlin.core/declarations.md

@@ -1894,7 +1894,7 @@ By supplying this annotation the author of the code explicitly declares that saf
 >     // Need to find variance of F1<in Foo<S>, out Unit> in S
 >     // F1<in P1, out R> is contravariant (-) in P1
 >     // Foo<S> is contravariant (-) in S
->     // Applying variance composition: - \text{$\otimes$} - = + (covariance)
+>     // Applying variance composition: - ⊗ - = + (covariance)
 >     // Variance of F1<in Foo<S>, out Unit> in S -- covariance
 > }
 >
@@ -1906,8 +1906,8 @@ By supplying this annotation the author of the code explicitly declares that saf
 >     // test has type F1<in In<In<I>>, out Unit>
 >     // Need to find variance of F1<in In<In<I>>, out Unit> in I
 >     // In<I> is contravariant (-) in I
->     // In<In<I>> is covariant in I, since - $\otimes$ - = + (covariance)
->     // F1<in In<In<I>>> is contravariant in I, since - $\otimes$ + = - (contravariance)
+>     // In<In<I>> is covariant in I, since - ⊗ - = + (covariance)
+>     // F1<in In<In<I>>> is contravariant in I, since - ⊗ + = - (contravariance)
 > }
 > ```
 >

docs/src/md/preamble.tex

@@ -27,6 +27,7 @@
 \newunicodechar{⊆}{$\subseteq$}
 \newunicodechar{⊤}{$\top$}
 \newunicodechar{⊥}{$\bot$}
+\newunicodechar{⊗}{$\otimes$}
 
 \hyphenation{
 Sus-pend-Co-ro-u-ti-ne-Un-in-ter-cep-ted-Or-Re-turn