minor fix

Author: Fe-r-oz

docs/src/Classical/new_codes_from_old.md

@@ -23,15 +23,27 @@ construction_X3
 
 The direct sum code has generator matrix `G1 ⊕ G2` and parity-check matrix `H1 ⊕ H2`.
 
+```@docs
+⊕
+```
+
 The generator matrix of the (direct) product code is the kronecker product of the generator matrices of the inputs.
 
+```@docs
+×
+```
+
 The parity-check matrix of the tensor product code is the kronecker product of the parity-check matrices of the inputs.
 
 There is some debate on how to define this product. This is known to often be the full ambient space.
 ```@docs
 entrywise_product_code
 ```
 
+```@docs
+/
+```
+
 `juxtaposition` is representation dependent and therefore works on the potentially over-complete generator matrices, not on the standard form.
 ```@docs
 juxtaposition

docs/src/Tutorials/Message Passing.md

@@ -1217,6 +1217,11 @@ By distance eight, scheme one was difficult to run without a cluster. We did not
 
 Logical errors were equally distributed among the cosets and only occurred on odd-distance codes.
 
+
+
+
+
+
 julia> x = -20:.05:20; y = [abs(atanh(tanh(x)) - x) for x in x]; y2 = [exp(2abs(x)) / 2^56 for x in x]; plot(x, [replace(y, 0.0 => 1e-21) y2], ylims = (1e-20, 1), yscale = :log10, linewidth = 0.5, label = ["abs(atanh(tanh(x)) - x)" "exp(2abs(x)) / 2^56"])
 
 p = 1 - 1/(1 + exp(LLR)) if LLR = log(p / (1 - p))