Merge pull request #2068 from tshepang/patch-1

const_eval.md: add missing word

Author: traviscross

src/const_eval.md

@@ -14,11 +14,13 @@ Certain forms of expressions, called constant expressions, can be evaluated at
 compile time.
 
 r[const-eval.const-expr.const-context]
-In [const contexts](#const-context), these are the only allowed
-expressions, and are always evaluated at compile time.
+Expressions in a [const context] must be constant expressions.
+
+r[const-eval.const-expr.evaluation]
+Expressions in const contexts are always evaluated at compile time.
 
 r[const-eval.const-expr.runtime-context]
-In other places, such as [let statements], constant expressions *may* be, but are not guaranteed to be, evaluated at compile time.
+Outside of const contexts, constant expressions *may* be, but are not guaranteed to be, evaluated at compile time.
 
 r[const-eval.const-expr.error]
 Behaviors such as out of bounds [array indexing] or [overflow] are compiler errors if the value