Fix grammatical error

doc/modules/ROOT/pages/getting-started/fastrp-knn-example.adoc

@@ -155,7 +155,7 @@ RETURN similarityDistribution.mean AS meanSimilarity  // <4>
 <2> Name of the projected graph to run the algorithm on.
 The `write` mode does not update the in-memory graph.
 <3> Configuration parameters listed in the xref:algorithms/knn.adoc#algorithms-knn-syntax[Syntax section] of the algorithm (`Write mode` panel).
-The `nodeLabels` option is set to ['Person'], because are interested only in `Person`-`Person` similarities and don't want to mix up such similarities with e.g. `Person`-`Product` similarities.
+The `nodeLabels` option is set to ['Person'], because we are interested only in `Person`-`Person` similarities and don't want to mix up such similarities with e.g. `Person`-`Product` similarities.
 Here, `topK` is set to 2 to select only the two closest targets of a source node, while the `sampleRate` and the `deltaThreshold` are set to 1 and 0 respectively because the graph is small.
 The `concurrency` and the `randomSeed` are set to obtain the same results for every run, but are not necessary for the actual computation.
 The two `write` properties are used to write a new `:SIMILAR` relationship with a `score` property containing the similarity score between two nodes.