Typo fix

Author: andrejanesic

constants.py

@@ -18,7 +18,7 @@
 TEXT_GEN   = "🎧 gen [name] [harmonics] [duration] ::: Generates a sound wave with the given name and number of harmonics, lasting [duration] ms. If no name provided, name will be generated. Harmonics number equals 10 by default. Duration equals 100 (ms) by default."
 TEXT_NOT_LOADED = "🤔 I couldn't find sound wave \"%s\", did you load it? "
 TEXT_INVALID_SYNTAX = "🤔 I couldn't understand that. Try this command:"
-TEXT_INVALID_SYNTAX_PLOT_WINDOW_T = "🤔 Oops. If you specify -w, you need to enter a starting and ending timestamp, like so: -t 200-500. Ending timestamp must be larger than starting timestamp."
+TEXT_INVALID_SYNTAX_PLOT_WINDOW_T = "🤔 Oops. If you specify -w, you need to enter a starting and ending timestamp, like so: -w 200-500. Ending timestamp must be larger than starting timestamp."
 TEXT_INVALID_SYNTAX_PLOT_WINDOW = "🤔 Oops, something went wrong. One or more sound waves specified are not available at the specified timestamp."
 TEXT_INVALID_SYNTAX_PLOT_WINDOW_F = "🤔 Oops, %s is not a valid window function. Choose \"none\", \"hamming\" or \"hanning\"."
 TEXT_INVALID_SYNTAX_PLOT_TYPE = "🤔 Oops, %s is not a valid plot type. Choose \"waveform\", \"spectrogram\" or \"histogram\"."