Merge pull request #674 from ArnoStrouwen/patch-1

Fix unclickable link

Author: ChrisRackauckas

docs/src/IR.md

@@ -9,8 +9,7 @@ at the top, an `Equation`, normally written as `op1 ~ op2`, defines the
 symbolic equality between two operations.
 
 ### Types
-`Sym`, `Term`, and `FnType` are from `SymbolicUtils.jl`. For more details,
-checkout https://juliasymbolics.github.io/SymbolicUtils.jl/api/. Note that in
+`Sym`, `Term`, and `FnType` are from [SymbolicUtils.jl](https://juliasymbolics.github.io/SymbolicUtils.jl/api/). Note that in
 ModelingToolkit, we always use `Sym{Real}`, `Term{Real}`, and
 `FnType{Tuple{Any}, Real}`. To get the arguments of a `Term` use
 `arguments(t::Term)`, and to get the operation of a `Term` use