Spelling and grammar fixes for console output

This commit fixes a typo in a console debug message encountered during
encoding. It also fixes a grammatical error in the same message.

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
diff --git a/src/flac/encode.c b/src/flac/encode.c
index 4512a72..6c37f85 100644
--- a/src/flac/encode.c
+++ b/src/flac/encode.c
@@ -1668,8 +1668,8 @@
 			"FAILURE: Compression failed (ratio %0.3f, should be < 1.0).\n"
 			"This happens for some files for one or more of the following reasons:\n"
 			" * Recompressing an existing FLAC from a higher to a lower compression setting.\n"
-			" * Insufficient input data  (eg, very short files, < 10000 frames).\n"
-			" * The audio data is not compressable (eg a full range white noise signal).\n"
+			" * Insufficient input data  (e.g. very short files, < 10000 frames).\n"
+			" * The audio data is not compressible (e.g. a full range white noise signal).\n"
 			, e->compression_ratio);
 		if (error_on_compression_fail)
 			ret = 1;