Fix the error messages as suggested.

Author: Prabhuk

lld/MachO/InputFiles.cpp

@@ -809,15 +809,15 @@ void ObjFile::parseSymbols(ArrayRef<typename LP::section> sectionHeaders,
 
     if ((sym.n_type & N_TYPE) == N_SECT) {
       if (sym.n_sect == 0) {
-        fatal("Section symbol " + StringRef(strtab + sym.n_strx) + " in " +
+        fatal("section symbol " + StringRef(strtab + sym.n_strx) + " in " +
               toString(this) + " has an invalid section index [0]");
       }
       if (sym.n_sect > sections.size()) {
-        fatal("Section symbol " + StringRef(strtab + sym.n_strx) + " in " +
+        fatal("section symbol " + StringRef(strtab + sym.n_strx) + " in " +
               toString(this) + " has an invalid section index [" +
               Twine(static_cast<unsigned>(sym.n_sect)) +
               "] greater than the total number of sections [" +
-              Twine(sections.size()) + "].");
+              Twine(sections.size()) + "]");
       }
       Subsections &subsections = sections[sym.n_sect - 1]->subsections;
       // parseSections() may have chosen not to parse this section.

lld/test/MachO/handle-invalid-section-reference-too-big.test

@@ -22,7 +22,7 @@
 # RUN: yaml2obj %s -o %t
 # RUN: not %lld -platform_version macos 10.14 11.0 -arch arm64 %t 2>&1 | FileCheck %s --check-prefix=FATAL
 
-# FATAL: error: Section symbol ltmp0 in {{.*}} has an invalid section index [10] greater than the total number of sections [2].
+# FATAL: error: section symbol ltmp0 in {{.*}} has an invalid section index [10] greater than the total number of sections [2]
 
 --- !mach-o
 FileHeader:

lld/test/MachO/handle-invalid-section-reference-zero.test

@@ -22,7 +22,7 @@
 # RUN: yaml2obj %s -o %t
 # RUN: not %lld -platform_version macos 10.14 11.0 -arch arm64 %t 2>&1 | FileCheck %s --check-prefix=FATAL
 
-# FATAL: error: Section symbol ltmp0 in {{.*}} has an invalid section index [0]
+# FATAL: error: section symbol ltmp0 in {{.*}} has an invalid section index [0]
 
 --- !mach-o
 FileHeader: