fix vignette

vignettes/a-end-to-end-untargeted-metabolomics.qmd

@@ -1878,7 +1878,7 @@ correct for biological variance and only technical.
 We compare the RLA plots before and after between-sample normalization to
 evaluate its impact on the data.
 
-```{r rla-plot-after-norm2, fig.height=8, fig.width=6}}
+```{r rla-plot-after-norm2, fig.height=8, fig.width=6}
 #| fig-cap: "Figure 33. RLA plot before and after normalization."
 #| code-fold: true
 #| code-summary: "Show the code"

vignettes/alignment-to-external-dataset.qmd

@@ -16,14 +16,12 @@ library(quarto)
 knitr::opts_knit$set(root.dir = './')
 ```
 
-
 ```{css, echo = FALSE}
 .verysmall .table{
   font-size: 8px;
 }
 ```
 
-
 # Introduction
 
 In certain experiments, aligning datasets recorded at different times is