Merge pull request /issues/227 from klemensnoga/patch-1

Minor spellcheck in 03-trimming.md

episodes/03-trimming.md

@@ -94,7 +94,7 @@ In this example, we've told Trimmomatic:
 | code   | meaning |
 | ------- | ---------- |
 | `PE` | that it will be taking a paired end file as input |
-| `-threads 4` | to use four computing threads to run (this will spead up our run) |
+| `-threads 4` | to use four computing threads to run (this will speed up our run) |
 | `SRR_1056_1.fastq` | the first input file name |
 | `SRR_1056_2.fastq` | the second input file name |
 | `SRR_1056_1.trimmed.fastq` | the output file for surviving pairs from the `_1` file |