Updates a space to align the format (ton-community#944)

Updates a space to align the format

Author: howardpen9

docs/v3/documentation/data-formats/tlb/tl-b-language.mdx

@@ -218,7 +218,7 @@ simple types, parametrized types with suitable parameters or complex expressions
 ### Extend cell with references
 
 ```tlb
-_ a:(##32) ^[ b:(##32) c:(## 32) d:(## 32)] = A;
+_ a:(##32) ^[ b:(## 32) c:(## 32) d:(## 32)] = A;
 ```
 
 - If for some reason we want to separate some fields to another