Update assets/multiqc/deseq2_clustering_header.txt

Co-authored-by: Matthias Hörtenhuber <mashehu@users.noreply.github.com>

assets/multiqc/deseq2_clustering_header.txt

 #id: 'deseq2_clustering'
 #section_name: 'MERGED LIB: DESeq2 sample similarity'
-#description: "is generated from clustering the Euclidean distances between
+#description: "Matrix is generated from clustering with Euclidean distances between
 #              <a href='https://bioconductor.org/packages/release/bioc/html/DESeq2.html' target='_blank'>DESeq2</a>
 #              rlog values for each sample
 #              in the <a href='https://github.com/nf-core/chipseq/blob/master/bin/deseq2_qc.r'><code>deseq2_qc.r</code></a> script."