docs: increase font size for code (#433)

docs/docs/reference_home.Rmd

@@ -46,7 +46,7 @@ of contexts:
 
 * select and modify columns with `select()` and `with_columns()`;
 * filter rows with `filter()`;
-* group and aggregate rows with `groupby()` and `agg()`
+* group and aggregate rows with `group_by()` and `agg()`
 
 Inside each context, you can use various **expressions** (aka. `Expr`). Some expressions cannot
 be used in some contexts. For example, in `with_columns()`, you can only apply

docs/docs/stylesheets/extra.css

@@ -12,9 +12,16 @@ pre.r-example {
 }
 
 .md-typeset pre > code {
-	font-size: 0.7rem;
+	font-size: 0.73rem;
+}
+
+.md-typeset code {
+  font-size: 0.8rem;
 }
 
+.md-typeset h2 > code {
+	font-size: 1.2rem;
+}
 
 /*
 Fonts are the same as pkgdown websites (otherwise tables not properly formatted)

vignettes/polars.Rmd

@@ -64,7 +64,7 @@ Users can find detailed documentation for all objects, functions, and methods
 on the Reference page of [this website](https://rpolars.github.io/). This documentation
 can also be accessed from the R console using the typical `?` syntax. For
 example, we will later use the `DataFrame()` constructor function and apply the
-`groupby()` method to a `DataFrame` object. The documentation for these can be
+`group_by()` method to a `DataFrame` object. The documentation for these can be
 accessed by typing these commands:
 
 ```r
@@ -84,7 +84,7 @@ dataset.
 
 ```python
 # Python
-df.groupby("id").mean()
+df.group_by("id").mean()
 ```
 
 ```r
@@ -270,7 +270,7 @@ dat$with_columns(
 ```
 
 Similarly, here's how we could have aggregated (i.e., collapsed) the dataset
-by groups instead of modifying them. We need simply invoke the `groupby()` and
+by groups instead of modifying them. We need simply invoke the `group_by()` and
 [`agg()`](https://rpolars.github.io/reference/Expr_agg_groups/) methods.
 
 ```{r}