docs(nuclei): Fix grammatical error in sentence about optimizing Nuclei for mass scanning. (#138)

Author: mikejarrett

tools/nuclei/mass-scanning-cli.mdx

@@ -110,7 +110,7 @@ Nuclei is a highly concurrent tool that has major Network I/O due to nature of t
 
 ## Recommendations for Optimizing Resource Usage
 
-Currently, here is no out-of-the-box solution to optimize Nuclei automatically for mass scanning. Understanding the proper use of flags and options can help in optimizing Nuclei for mass scanning.
+Currently, there is no out-of-the-box solution to optimize Nuclei automatically for mass scanning. Understanding the proper use of flags and options can help in optimizing Nuclei for mass scanning.
 
 In general, here are some recommendations to optimize Nuclei for mass scanning: