message: Repeated "if" in the doc.
diff: @@ -106,7 +106,7 @@ namespace alpha_complex {
  * \quad\quad\quad\quad \text{filtration(} \tau \text{) = min( filtration(} \tau \text{), filtration(} \sigma
  * \text{) )}\\
  * \quad\quad\quad \textbf{else}\\
  - * \quad\quad\quad\quad \textbf{if } \textbf{if } \tau \text{ is not Gabriel for } \sigma \textbf{ then}\\
  + * \quad\quad\quad\quad \textbf{if } \tau \text{ is not Gabriel for } \sigma \textbf{ then}\\
  * \quad\quad\quad\quad\quad \text{filtration(} \tau \text{) = filtration(} \sigma \text{)}\\
  * \quad\quad\quad\quad \textbf{end if}\\
  * \quad\quad\quad \textbf{end if}\\
  